metric sign

Metric Measurements
(as seen on postal items)

metric sign

Below is a checklist of Metric measurements (consisting of numbers and their associated metric units) on postal items (stamps, souvenir sheets, aerogrammes, postal cards, etc.). Catalog numbers, years of issue, and notes on the items featured are given when available. If readers know of additional information or images, please contact the author using the e-mail address at the bottom of this page.

This list does not include postal items specifically about the metric system (SI), many of which show metric units.

This list does not include stamped envelopes, postal cards, postcards, and cachets on FDCs and other covers, as there are way too many of these types of items with measurement units on them.

Sections/divisions of the table belowSee also these links for additional items not in the table below
Lengthnanometer (nm), centimeter (cm), meter (m), and kilometer (km)
centimeter (cm) and decimeter (dm)
(All items are found on other pages)
Water-depth gauges section of Precipitation (Rain and Snow) Gauges
Massgram (g), kilogram (kg), and metric ton or tonne (t)
Temperaturedegree Celsius (°C) and kelvin (K)
(All items are found on other pages)
Temperature values and/or units section of Thermometers, Temperatures, and Temperature Units
Also Weather Maps
Pressurehectopascal (hPa) and millimeter of mercury (mm Hg)
(Atmospheric-related items are found on other pages)
Atmospheric pressure and pressure units section of Barometers, Atmospheric Pressure, and Pressure Units
Also Weather Maps
Powerwatt (W), and megawatt (MW)
Energykilowatt-hour (kWh)
Timesecond (s)
Frequencykilohertz (kHz), megahertz (MHz), and gigahertz (GHz)
Areahectare (ha) and square kilometer (km2)
Volumeliter (L or l)
Velocity/Speedkilometer per hour (km/h)Wind measurements section of Anemometers, Windsocks, Wind Vanes, Wind Measurements, and Wind Towers
Other SI/metric unitsmolecules/cm3, ohms, and volts

CountryCatalog NumberType of ItemYear of IssueNotes on Content
Length: nanometer (nm), centimeter (cm), meter (m) and kilometer (km)
Andorra (French)747 (Mi790)2015"2942.6 m" elevation: Pic del Comapedrosa
Austria739 (Mi1174)1964"m" band, shortwave radio
Austria739 fdcStamp on FDC
Austria1359 (Mi1857)1986"3106 m" elevation: Sonnblick
Austria1359 maxiMaxicard
Austria1359 fdc1Stamp and cachet on FDC
Austria1359 fdc2Stamp on FDC
Austria1359 fdc3Stamp on FDC (different)
AustraliaNonePrinted stamp on aerogramme (A70)31985"150 km" distance: road sign, kangaroo
AustraliaNonePrinted stamp (same) on aerogramme (A71)3
AustraliaNonePrinted stamp (same) on aerogramme (A72)3
AustraliaNonePrinted stamp (same) on aerogramme (A73)3
Bhutan1591a (Mi3085)From MS8 (1591 (a-h)) (Mi3085-3092)2017"6714 m" elevation: Jichudrake
Bhutan1591b (Mi3086)"7094 m" elevation: Gangchen Singye
Bhutan1591c (Mi3087)"6784 m" elevation: Gangchen Taag
Bhutan1591d (Mi3088)"5330 m" elevation: Chundugang
Bhutan1591e (Mi3089)"7326 m" elevation: Jumolhari
Bhutan1591f (Mi3090)"7194 m" elevation: Masagang
Bhutan1591g (Mi3091)"4250 m" elevation: Tsherimgang
Bhutan1591h (Mi3092)"7207 m" elevation: Tarigang
Bhutan1592 (BL586)SS1 (Mi3093)"7570 m" elevation: Gangkhar Puenseum; "7000 m" and 7570 m" elevations (in lower margin)
Bhutan1592 fdcSS1 on FDC
Brazil3397d (Mi4594)One of MS4 (3397 (a-d)) (BL193, Mi4591-4594)2018"metros" (meters): various AM and shortwave radio wavelengths
Bulgaria301 (Mi304)1936"2925 m" elevation: Mt. Moussalla
Cambodia711 (Mi789)1986"km" distances: for cometary images obtained by Vega-1
Canada1063 (Mi972)From block of 4 (1066a (1063-1066))1985"21.3 m" elevation: lighthouse, Sisters Islets
Canada1064 (Mi973)"22.6 m" elevation: lighthouse, Pelee Passage
Canada1065 (Mi974)"25.3 m" elevation: lighthouse, Haut-fond Prince
Canada1066 (Mi975)"15.2 m" elevation: lighthouse, Rose Blanche
Canada1066a fdc1Block of 4 stamps on FDC (Canada Post cachet), also back(As above for stamps)
Canada1066a fdc2Block of 4 stamps on FDC (Fleetwood cachet), also back
Canada1066b (BL4)MS4 (1063-1066)
Canada1831b (Mi1821)One of MS4 (1831 (a-d)) (BL49, Mi1820-1823)2000"100 m" map scale: dam
Canada1831 fdcMS4 on FDC, also back
Canada1960a (Mi2074)From MS8 (1960 (a-h))2002"5959 m" elevation: Mt. Logan, Canada
Canada1960b (Mi2075)"5633 m" elevation: Mt. Elbrus, Russia
Canada1960c (Mi2076)"4884 m" elevation: Puncak Jaya, Indonesia
Canada1960d (Mi2077)"8850 m" elevation: Mt. Everest, Nepal/China
Canada1960e (Mi2078)"5984 m" elevation: Mt. Kilimanjaro, Tanzania
Canada1960f (Mi2079)"4897 m" elevation: Vinson Massif, Antarctica
Canada1960g (Mi2080)"6962 m" elevation: Mt. Aconcagua, Argentina
Canada1960h (Mi2081)"6194 m" elevation: Mt. McKinley, Alaska
Chad312 (Mi?)Blue overprint1976"90 metres", ski jump distance
Chad312 goldGold overprint
Chad312 dsDeluxe sheet (312)
Chad312 fdcStamp on FDC
ChadC179 (Mi?)Blue overprint"1,500 metres", skating distance
ChadC179 goldGold overprint
ChadC179 dsDeluxe sheet (C179)
Chile572 (Mi933)1980"8035 m" elevation: Mt. Gasherbrum-II
Congo (People's Republic, Brazzaville)899 (Mi1240)1991"7371 km" distance: Trans-Siberian Railroad
Congo (People's Republic, Brazzaville)900 (Mi1241)
Czechoslovakia837 (Mi1056)1957"2638 m" elevation: High Tatra
Czechoslovakia837 maxiMaxicard
Czechoslovakia836-838 fdcOne of three stamps on FDC
Denmark559 (Mi?)1974"mm" markings on ruler: 2 sides of plastic compass housing
Denmark875 (Mi?)1989numerous m (meter) depths (implied units): water soundings
Denmark1022 (Mi1096)1995"1 km" map scales, Danish islands
Denmark1023 (Mi1097)
Denmark1024 (Mi1098)
Denmark1025 (Mi1099)
Denmark1284 (Mi?)2004numerous m (meter) depths (implied units): water soundings
Ecuador748A (Mi1991)1966"35,900 km" altitude: geostationary orbit
Faroe Islands161 (Mi154)1987"2 km" map scale: island
Finland1197 (Mi?)MS4 (a-d)2003several "m" heights, lighthouses
FranceNoneMeter on cover1951"300 mètres" height: Eiffel Tower
France3786 (Mi?)From booklet pane of 12 (3793a (3782-3793))2010"5 m" level: "inondation" (flood)
France3786 maxiMaxicard
French Polynesia783 (Mi824)2000"2000 m", "2066 m", and "2241 m" elevations: Mt. Aroai and Mt. Orohena
French Polynesia784 (Mi825)
French Polynesia784 fdcStamp and (text) cancel and cachet (design like stamp) on FDC
French Southern and Antarctic TerritoriesC122 (Mi292)
iC122

Imperforate
1992"10 cm" altitude precision
French Southern and Antarctic TerritoriesC122 fdcStamp on FDC
French Southern and Antarctic TerritoriesC122 maxi1Maxicard
French Southern and Antarctic TerritoriesC122 maxi2Maxicard (different cancel)
French Southern and Antarctic Territories335 (Mi?)2004"1100 km", "1200 km", and "2700 km" distances: flight tracks
French Southern and Antarctic Territories340 (Mi?)2004numerous m (meter) depths (implied units): water soundings
French Southern and Antarctic Territories468c (Mi784)One of strip of 5 (468 (a-e + 5 labels)) (Mi782-786), or five of MS25 (468f (5x 468 (a-e + 5 labels)))2012"23,222 km altitude" (in French text)
Ghana2909b (Mi?)From MS4 (2909 (a-d))2016"325,000 km" flyby
Ghana2909d (Mi?)"127,000 km" flyby
Ghana2909b proofFrom MS4 (2909 signed-proof (a-d))"325,000 km" flyby
Ghana2909d proof"127,000 km" flyby
Ghana2909a-d+2910 fdcTwo of four stamps on FDC(As above for stamps)
Ghana2909 fdcMS4 on FDC
Gibraltar841a (Mi914)One of MS16 (841 (a-p))2000"3000 metre" waterfall: 5 million BC
Great Britain1968 (Mi?)2001"depth in metres"
Great Britain1968 cardPHQ card back, also front
Great Britain2754a (BL?)In (lower-left) margin of booklet pane of 4 (2748-2749+2x 2754), from (2756a presentation pack2010"27 km" distance/length: "100 m" depth/underground: Large Hadron Collider at CERN
Great Britain3115 (Mi3368)From presentation pack (3113-3118) (Mi3366-3371)2012"35 km" wide: impact crater photographed by Mars Express
Great Britain3113-3118 fdc1One of six stamps on FDC (Tallents House, Edinburgh cancel, Royal Mail cachet)
Great Britain3113-3118 fdc2One of six stamps on FDC (Star Gaerwen, Gwynedd cancel, Royal Mail cachet)
Great Britain3113-3118 fdc3One of six stamps on FDC (Sunbeam Way, Birmingham cancel, Royal Mail cachet)
Great Britain3113-3118 fdc4One of six stamps on FDC (Picadilly, London cancel, Royal Mail cachet)
Great Britain3113-3118 fdc5One of six stamps on FDC (Macclesfield, Cheshire cancel, Cotswold Covers/BPCPA cachet)
Greenland613 (Mi?)2012"meter" elevations (on map of Denmark covered with ice): "km" distance (on SS1)
Greenland613aSS1 (613)
Greenland613a fdcSS1 and cachet on FDC
Italy1942 (Mi2289)1993"4559 m" elevation: observatory
ItalyNonePhonecard?"cm 76" height: mercury barometer
Korea (North)4855 (BL724)On stamp of SS12009"490 km x 1426 km" perigee and apogee heights: intended orbit for [failed] KMS-2 satellite
Korea (North)4855 proofImperforate MS2 proof of 4855 stamp
Korea (North)5147 (BL857)
i5147
SS1
Imperforate SS1
2012"495.7 km" and 584.1 km" perigee and apogee heights: orbit for KMS-3-2
Korea (North)Unknown ss (BL908)In (right) margin of SS12016"494.6 km" and "500 km" perigee and apogee heights: orbit for KMS-4
Kyrgyzstan153 (Mi?)2000"7010 m" elevation: Khan-Tengri
Kyrgyzstan154 (Mi?)"7439 m" elevation: Victory Peak
Kyrgyzstan155 (Mi?)"7134 m" elevation: Lenin Peak
Kyrgyzstan155a (Mi?)MS3 (153-154 + label)various "m" elevations: mountains (as above)
Laos89 (Mi?)1964"1100 km" and "1650 km" distances
Laos89 dsDeluxe sheet (89)
Laos90 (Mi?)
Laos90 dsDeluxe sheet (90)
Laos91 (Mi?)
Laos91 dsDeluxe sheet (91)
Laos89-91 fdcThree stamps on FDC
Laos91a (BL30)MS3 (89-91)
Malagasy Republic566 (Mi814A)
i566 (Mi814B)

Imperforate
1976"m" heights and "km" distances: Viking orbiter elevation data
Malagasy Republic566 ds1Imperforate deluxe sheet (566)
Malagasy Republic566 ds2Imperforate deluxe sheet (566) on white cardboard
ManamaMi320A
Mi320B
Two of MS32 (2x (Mi306A-321A))
Two of imperforate MS32 (2x (Mi306B-321B))
1970"45 km" altitude: Lunar Orbiter
ManamaMi320 ssSS1 (Mi320)
Mexico1721 (Mi2272)1992centimeter (implied units) height scale
Monaco672 (Mi873)1967numerous m (meter) depths (implied units): water soundings
MongoliaUnknown ss (BL?)2018"8848 m" and other elevations: Mr. Everest and other mountains
Montserrat1357c-d (Mi1754-1755)Two stamps from MS4 (1357 (a-d)) (Mi1752-1755)2015"nanometers": wavelengths
Nepal450 (Mi?)1986"7161 m" elevation: Mt. Pumori
Nepal462 (Mi?)1987"6883 m" elevation: Mt. Kanjiroba
Nepal477 (Mi?)1989"6812 m" elevation: Mt. Amadablam
Nepal495 (Mi?)1991"7710 m" elevation: Mt. Kumbhakarna
New Zealand1680a (BL124)In (upper-right) margin of MS4 (1677-1680)2001"km" distances: signpost
New Zealand2176 (Mi?)2008"km" distances: road sign
Norway1570 (BL37)MS2 (1570 (a-b))2009"6 million square kilometers" and "2 million square kilometers"
Pakistan550a (Mi?)Pair (549-550)1981"7452 m" elevation: Malubiting West (peak)
Pakistan552a (Mi?)Pair (551-552)"7406 m" elevation: Mt.Maramosh
Pakistan554a (Mi?)Pair (553-554)"7281 m" elevation: K6 (peak)
Pakistan556a (Mi?)Pair (555-556)"8611 m" and other elevations: K2 (peak) and others
Pakistan550a-556a fdcFour pairs of stamps on FDC(As above for stamps)
Pakistan647 (Mi653)1985"7790 m" elevation: Mt. Rakaposhi
Pakistan648 (Mi654)"8125 m" elevation: Mt. Nangaparbat
Pakistan647-648 fdcTwo stamps on FDC, also back(As above for stamps)
Pakistan647-648 folderFolder
PalauKM211$5. (silver coin) reverse, also obverse2009"2916 m" elevation: Zugspitze
PalauKM212$5. (silver coin) reverse, also obverse"3798 m" elevation: Grossglockner
PalauKM213$5. (silver coin) reverse, also obverse"4478 m" elevation: Matterhorn
PalauKM214$5. (silver coin) reverse, also obverse"2995 m" elevation: Dachstein
PalauKM215$5. (silver coin) reverse, also obverse"4808 m" elevation: Mont Blanc
PalauKM216$5. (silver coin) reverse, also obverse"2713 m" elevation: Watzmann
PalauKM217$5. (silver coin) reverse, also obverse"1893 m" elevation: Otscher
PalauKM218$5. (silver coin) reverse, also obverse"3312 m" elevation: Pizbuin
PalauKM293$5. (silver coin) reverse, also obverse2010"8848 m" elevation: Mt. Everest
PalauKM294$5. (silver coin) reverse, also obverse"5895 m" elevation: Kilimanjaro
PalauKM295$5. (silver coin) reverse, also obverse"5642 m" elevation: Elbrus
PalauKM296$5. (silver coin) reverse, also obverse"4884 m" elevation: Carstensz Pyramid
PalauKM297$5. (silver coin) reverse, also obverse"6195 m" elevation: Mt. McKinley
PalauKM298$5. (silver coin) reverse, also obverse"6962 m" elevation: Aconcagua
PalauKM299$5. (silver coin) reverse, also obverse"4892 m" elevation: Mt. Vinson
PalauKM300$5. (silver coin) reverse, also obverse"3970 m" elevation: Mt. Eiger
PalauKM301$5. (silver coin) reverse, also obverse"863 m" elevation: Ayers Rock
PalauKM302$5. (silver coin) reverse, also obverse"2628 m" elevation: Alpspitze
PalauKM397$5. (silver coin) reverse, also obverse2011"8611 m" elevation: K2 (peak)
PalauKM398$5. (silver coin) reverse, also obverse"5199 m" elevation: Mt. Kenya
PalauKM399$5. (silver coin) reverse, also obverse"5959 m" elevation: Mt. Logan
PalauKM400$5. (silver coin) reverse, also obverse"4852 m" elevation: Mt. Tyree
PalauKM401$5. (silver coin) reverse, also obverse"5204 m" elevation: Dykh Tau
PalauKM402$5. (silver coin) reverse, also obverse"6893 m" elevation: Ojos del Salado
PalauKM403$5. (silver coin) reverse, also obverse"4750 m" elevation: Puncak Trikora
PalauKM-unknown$5. (silver coin) reverse, also obverse"3775 m" elevation: Mt. Fuji
PalauKM477$5. (silver coin) reverse, also obverse2014"4392 m" elevation: Mount Rainier
PalauKM481$5. (silver coin) reverse, also obverse"8126 m" elevation: Nanga Parbat
PalauKM482$5. (silver coin) reverse, also obverse"4274 m" elevation: Finsteraarhorn
PalauKM483$5. (silver coin) reverse, also obverse"8167 m" elevation: Dhaulagiri
PalauKM484$5. (silver coin) reverse, also obverse"4107 m" elevation: Mönch
PalauKM485$5. (silver coin) reverse, also obverse"8091 m" elevation: Annapurna
These 'Mountains and Flora' coins from Palau continue thru 2016; newer items will be added when their KM numbers are known
Panama459G (Mi803)
i459G (Mi811)

Imperforate with changed colors
1965"4827" m, elevation of photo from Ranger-7
Panama459Gh (BL32)
i459Gh (BL33)
SS1
Imperforate SS1, changed colors
Panama491A (Mi1103a)
i491A (Mi1104a)
459G overprinted in black
i459G overprinted in black, changed colors
1968"4827" m, elevation of photo from Ranger-7
Panama491A var (Mi1103b)
i491A var (Mi1104b)
459G overprinted in gold
i459G overprinted in gold, changed colors
Panama491Ab (BL97a)
i491Ab (BL98a)
On stamp of SS1, 459Gh overprinted in black
On stamp of imperforate SS1, i459Gh overprinted in black, changed colors
Panamai491Ab var (BL98b)On stamp of imperforate SS1, i459Gh overprinted in gold, changed colors
ParaguayC411 (BL247)In (lower-left) margin of SS11975"40,000 km" distance: Pioneer-11 to reach Jupiter
Poland1010 (Mi1258)1961"700,000 km" distance: traveled by Vostok-2
Poland1009-1010 fdcOne of two stamps on FDC
Poland1093 (BL28)In (upper) margin of SS11962"2,600,000 km" and "2,000,000 km" distances: traveled by Vostok-1 and Vostok-2
Poland2355 (Mi2647)1979"646 m" height: broadcasting tower
Poland4291 (BL263)In (left) margin of SS1 (Mi4916)2017numerous "m" elevations, mountain summits
Romania5157 (Mi?)From MS8 (5157a (8x 5157 + label))2010"15 m" height: lighthouse
Romania5158 (Mi?)"17.5 m" height: lighthouse
Romania5159 (Mi?)"10 m" height: lighthouse
Romania5160 (Mi?)"43.9 m" height: lighthouse
Romania5161 (Mi?)"18 m" height: lighthouse
Romania5157+5161 fdcTwo stamps on FDC(As above for stamps)
Russia5106 (BL160)SS11982"8848 m" elevation: Mt. Everest
St. Pierre and Miquelon549 (Mi596)Also gutter-pair1990"25 km" foot race
Samoa654 (BL36)SS1 (Mi570)1985"metres" sea depth map with legend
Samoa654 fdcSS1 on FDC
Sierra LeoneUnknown a (Mi?)One of MS4 (a-d)2016"8848 m": Mt. Everest
Sierra LeoneUnknown ms fdcMS4 on FDC
Sierra LeoneUnknown ss (BL?)In (lower-left) margin of SS1
Sierra LeoneUnknown ss fdcSS1 on FDC
Slovenia199 (Mi88)1994"2350 m" elevation: Mt. Ojstrica
Slovenia1133 (BL?)2015various "cm" lengths: tape measure
South Africa815 (Mi830)1991"4260 km" distance: Cape Town to Sanae (Base)
South Georgia and the South Sandwich Islands348 (Mi433-434)Strip of 2 (348 (a-b))2007numerous "m" elevations: topographic maps
South Georgia and the South Sandwich Islands349 (Mi435-436)Strip of 2 (349 (a-b))
Surinam385 (Mi601)1971"80 km" distance: Washington to Baltimore
Surinam386 (Mi602)"2500 km" distance: England to Sweden
Surinam387 (Mi603)"384,400 km" distance: interplanetary TV
Switzerland697 (Mi?)1981cm (centimeter) markings (implied units): surveyors rod
Switzerland946 (Mi1525)1994"-10,916 m" depth: bathyscaphe Trieste dive in 1960
Switzerland947 (Mi1526)"+16,940 m" altitude: stratospheric balloon FNRS flight in 1932
Switzerland946-947 fdcTwo stamps and cachet on FDC(As above for stamps)
Switzerland946-947 folderFDOI folder, also inside
Switzerland1606 (Mi2443-2444)Strip of 2 stamps with label between2016"57,104 meter" length: Gotthard Base Tunnel
TogoBL1184SS12015"600 kilomètres" altitude: Hubble Space Telescope (HST)
Tristan Da Cunha285 (Mi295)1980"5 km" map scale: Tristan Island
Tristan Da Cunha286 (Mi296)"10 km" map scale: Gough Island
Tristan da Cunha371 (BL?)On stamp of SS119850-12 "km" map scale
Tristan da Cunha371 fdcSS1 on FDC
Tristan da Cunha415 (BL?)On stamp of SS119870-6 "km" map scale
Tristan da Cunha415 fdc1SS1 on FDC
Tristan da Cunha415 fdc2SS1 on FDC (different)
Tuvalu810 (BL70)In (lower) margin of MS6 (810 (a-f))1999"300 mm" average annual rainfall
United States3409a (Mi3361)From MS6 (3409 (a-f)) (BL55, Mi3361-3366)2000"2.4 m" diameter: optical telescope, Hubble Space Telescope (HST)
United States3409c (Mi3363)"10 m" diameter: twin (optical and infrared) telescopes, Keck Observatory
United States3409f (Mi3366)"305 m" diameter: radio telescope, Aricebo Observatory
United States3409a fdc1Stamp on FDC (Heritage cachet)(As above for stamps)
United States3409a fdc2Stamp on FDC (Heritage cachet, different cancel)
United States3409a fdc3Stamp on FDC (Artopages cachet)
United States3409a fdc4Stamp on FDC (Artmaster cachet)
United States3409a fdc5Stamp on FDC (Colorano silk cachet)
United States3409a fdc6Stamp on FDC (Space Voyage/First Rank cachet)
United States3409a fdc7Stamp on FDC (PCS cachet), and information card
United States3409a fdc8Stamp on FDC (GAMM cachet)
United States3409a fdc9Stamp on FDC (Webcraft add-on cachet)
United States3409c+f fdcTwo stamps on FDC (HF cachet)
United States3409 postcard(WSE2000) postcard based on 34092000(As above)
United StatesNone(Zazzle.com) personalized postage2016"m" height: storm surge; "km" (in text, but "kt" meant for wind speeds)
Yemen Arab RepublicMi14261971"16.5 m" class, sailboat
Yemen Arab RepublicMi1427"5.5 m" class, sailboat
Yemen Arab RepublicMi1428"16.5 m" class, sailboat
Mass: gram (g) and kilogram (kg)
Albania1360 (Mi1486)1971"173 kg": DFH-1 satellite
Albania1362 (Mi1488)"221 kg": SJ-1 satellite
Australia2893c (Mi?)In (left) margin of double-sided booklet pane of 8 (2x (2890-2893))2008"20 tonnes": greenhouse gas
China (People's Republic)4276 (Mi4678)2015"kg": artifact
Denmark833 (Mi890)1987"20 g" @ "14/kg": price sticker (error!)4
Great Britain2754a (BL?)In (lower-left) margin of booklet pane of 4 (2748-2749+2x 2754), from 2756a presentation pack2010"38,000 tonnes": Large Hadron Collider at CERN
NicaraguaCB1 (Mi?)1973"kilogramos" (kg) infant weights
RomaniaC56 (Mi1733)1958"1327 kg": Sputnik-3
RomaniaC56 fdcStamp on FDC
Russia (USSR)2083 (Mi2101)Stamp and label1958"1327 kg": Sputnik-3 (on label)
Pressure: hectopascal (hPa) and millimeter of mercury (mm Hg)
BelgiumB964 (Mi1934)1978"110-250 mm Hg" blood pressures: sphygmomanometer
BelgiumB964 fdcStamp on FDC
Libya730 (Mi643)1978"60-300 mm Hg" blood pressures: sphygmomanometer
Libya731 (Mi644)
Uganda207 (Mi187)1978"0-240 mm Hg" blood pressures: sphygmomanometer
Uganda210a (BL12)On one of MS4 (207-210)
Power: watt (W) and megawatt (MW)
Australia2893c (BL?)In (left) margin of double-sided booklet pane of 8 (2x (2890-2893))2008"92 watts": saved
Poland2355 (Mi2647)1979"2 MW": broadcasting station
United StatesNoneMeter1938"1000 watts": radio station power
Energy: kilowatt-hour (kWh)
Australia2893c (BL?)In (left) margin of double-sided booklet pane of 8 (2x (2890-2893))2008"807 kWh": saved
Time: second (s)
Canada1063 (Mi972)From block of 4 (1066a (1063-1066))1985"15 s" flash timing, lighthouse, Sisters Islets
Canada1064 (Mi973)"4 s" flash timing, lighthouse, Pelee Passage
Canada1065 (Mi974)"2 1/2 s" flash timing, lighthouse, Haut-fond Prince
Canada1066 (Mi975)"10 s" flash timing, lighthouse, Rose Blanche
Canada1066a fdc1Block of 4 stamps on FDC (Canada Post cachet), also back(As above for stamps)
Canada1066a fdc2Block of 4 stamps on FDC (Fleetwood cachet), also back
Canada1066b (BL4)MS4 (1063-1066)
Estonia541 (Mi?)20063.19 "s": isophase timing, lighthouse
Estonia542 (Mi?)6.23 "s": isophase timing, lighthouse
Estonia541-542 maxiTwo stamps on maxicard(As above for stamps)
Frequency: kilohertz (kHz), megahertz (MHz), and gigahertz (GHz)
Austria739 (Mi1174)1964"MHz" radio frequencies
Austria739 fdcStamp on FDC
Brazil3397d (Mi4594)One of MS4 (3397 (a-d)) (BL193, Mi4591-4594)2018various AM and shortwave radio frequencies ("KC"1 (kilohertz) and "MC"1 (megahertz), respectively)
British Virgin Islands557 (Mi?)In (lower) margin of MS2 (557 (a-b), like 551-552)1986"GHZ" (should be "GHz"): Eastern Caribbean microwave system
British Virgin Islands558 (Mi?)In (lower) margin of MS2 (558 (a-b), like 553-554)
Comoro Islands47 (Mi41)1960"3331-7260 kcs"1 (kilohertz), radio frequencies
Gambia3477b (Mi?)From MS4 (3477 (a-d))2013"101" MHz (implied units): FM radio frequency
Gambia3477c (Mi?)"508" kHz (implied units): AM radio frequency
Germany (West)1295 (Mi1015)1979(likely) "[xx.]70" and [xx.]80" MHz, amateur radio frequencies
Ireland974 (Mi904)One of pair (974a (973-974)) (Mi903-904)1995"102.7 MHz": FM radio frequency
Ireland974a fdcOne of pair of stamps and cachet on FDC
JapanNonePostal card1982"76.4 MHz, 80.4 MHz": broadcasting frequencies
Pabay Island (Scotland)Local2003"5 MHz": amateur radio
ParaguayNone+label (Mi?+label)Personalized stamp + label2011"680" kHz (implied units): broadcasting frequency
Poland2355 (Mi2647)1979"227 kHz": broadcasting frequency
PolandNonePostal card2002"225 kHz": broadcasting frequency
PolandNonePostal card2003"225 kHz": broadcasting frequency
RomaniaNoneStamped envelope1999"558 kHz": broadcasting frequency
United StatesNoneMeter1938"680 kc"1 (kilohertz): radio frequency
United StatesNone(Pictorial) cancel1977"100.1 mhz" (should be "MHz") and "6012 khz" (should be kHz): radio frequencies
Area: hectare (ha) and square kilometers (km2)
Argentina2274 (Mi2879-2880)Pair (2274 (a-b)), from MS20 (2274a (10x (2274 (a-b))))2004"millions of hectares": native forest area
Argentina2274 fdcPair of stamps on FDC
China (People's Republic)NonePostal card2002"Ozone hole has been as large as 24 million sq km" area (translated from the Chinese2)
Hungary2450 (Mi3170)1976"millionth hectare": reforestation
Netherlands1171 (Mi?)In (surrounding) margins of MS10 (1171 (a-j)), for example2004"km2" areas: new European Union countries
Volume: liter (L) or (l)
Australia2893c (BL?)In (left) margin of double-sided booklet pane of 8 (2x (2890-2893))2008"4.5/3 litre" dual-flush, and "35,000 litres": saved
China (People's Republic)4278 (Mi4678)2015"mL": flask
Velocity/Speed: kilometer per hour (km/h)
Argentina1331 (Mi1544)1981"80" km/h (implied units): red-circle speed limit sign
Argentina1331 fdc1Stamp on FDC (Círculo Filatélico de Liniers black cachet)
Argentina1331 fdc2Stamp on FDC (Círculo Filatélico de Liniers multi-color cachet)
China (People's Republic)4276 (Mi4678)2015"km/h": speedometer
Germany (East)1682 (Mi2082)1975"60" km/h (implied units): speed limit sign
Japan2717c (Mi?)One of MS10 (2717f (2717 (a-e))2005"256 km/h" record speed: bullet train
Kenya122 (Mi120)1978"50" km/h (implied units): speed limit sign
Korea (North)2638 (Mi2821)1987"10, 20, 60" km/h (implied units): speed limit signs
Malaysia1263 (Mi1674C)From strip of 5 (1264b (1260-1264)), or from booklet pane of 10 (1264a (2x (1260-1264))) (Mi1671C-1675C), with booklet cover2009"km/J" on analog dial (actually km/h, since J stands for "jam", the Malaysian word for hour)
Malaysia1264b fdcOne of five stamps on FDC
Maldive IslandsUnknown c (Mi?)One of MS4 (a-d)2017"265,000 km/h", "fastest man-made object relative to Earth"
Mexico2657 (Mi?)2009"60" km/h (implied units): red-circle speed limit sign
New Caledonia456 (Mi651)1980"30" km/h (implied units): speed limit sign
New Zealand2737e (Mi3476)One of MS14 (2737 (a-n)) (Mi3472-3485)2017"100" km/h (implied units) red-circle speed limit sign
Niger731 (Mi984)1986"80" km/h (implied units): red-circle speed limit sign
Niger732 (Mi985)"60" km/h (implied units): red-circle speed limit sign
Portugal1113 (Mi1146)See detail1971"km/h" velocity/speed, anemometer wind trace (It is not clear whether the "150" is the speed, or if it is an unrelated number associated with the upper graph)
Portugal1113 fdcStamp on FDC
Romania3499 (Mi4415)1975"0-100" km/h (implied units): car speedometer
Tunisia1555 (Mi1811)2013"90" km/h (implied units): red-circle speed limit sign
Turkey2370 (Mi2768)1987"70:"km/h (implied units): red-circle speed limit sign
United StatesNone(Zazzle.com) personalized postage2016"km/h": wind speeds
Other SI/metric units: molecules/cm3, ohms, and volts
AntarcticaP6$100. (banknote), also back1996"molecules/cm3" (on the ordinate in the graphic at the upper right)
AntarcticaP13$100. (banknote), also back2001"molecules/cm3" (on the ordinate in the graphic at the upper right)
AntarcticaP13s$100. (banknote) overprinted "specimen", also back2009
Brazil3397c (Mi4593)One of MS4 (3397 (a-d)) (BL193, Mi4591-4594)2018various labels on circuit components ("K" (kilohms), "M" (megohms), "V" (volts), other labels are likely nonsense)

1"kc" and "kcs" (kilocycles (per second)) as well as "MC" (megacycles) are old metric terms for SI (modern metric system) "kHz" (kilohertz) and "MHz" (megahertz).
2Instead of the international symbol "km" (kilometer), the Chinese use the following characters .
3Australian Stamp Catalog (ASC) number
4On Denmark 833, if the price for 20 g is 2.80 kroner, then the price per kilogram should be 140.00 kroner. The error is likely that the 2.80 kroner price should be for 200 g!


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