Metric System


Below is a checklist of metric system (International System of Units (SI)) 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 email address at the bottom of this page.
For postal items focusing on the personalities behind the metric units names, see the metric names page. Those items are not doublelisted here.
For postal items depicting metric units but not specifically about the metric system, see the metric measures page.
Sections/divisions of the table below 

Metric system (SI) 
100th Anniversary of the International Metre Convention (1875 — 1975) 
Country  Catalog Number  Type of Item  Year of Issue  Notes on Content 

Metric system (SI)  
Algeria  1727 (Mi?)  2017  31st anniv. National Office of Legal Metrology, 1986: SI base units  
Algeria  1727 fdc  Stamp and (pictorial) cancel and (Algeria Post) cachet on FDC  
Algeria  1727 folder  Folder  
Australia  541 (Mi513)  1973  conversion to metric system: (kg/stonesandpounds) mass, scale  
Australia  542 (Mi514)  conversion to metric system: (°C/°F) temperature, fever  
Australia  543 (Mi515)  conversion to metric system: (cm/feetandinches) length, tape measure  
Australia  544 (Mi516)  conversion to metric system: (mL/fluidounces) volume, drinking glass  
Australia  541544 fdc1  Four stamps and cachet on FDC  conversion to metric system  
Australia  541544 fdc2  Four stamps and cachet (different) on FDC  
Bangladesh  212 (Mi177)  1983  metric system: mail scale  
Bangladesh  213 (Mi178)  metric system: weights, measures  
Brazil  940 (Mi1018)  1962  100th anniv. introduction of metric system, 1862: millimeter gauge  
Cuba  2173 (Mi2268)  1977  SI (metric system) system: 7 (seven) SI base units, map  
Denmark  1388 (Mi?)  2007  100th anniv. metric system in Denmark  
Estonia  897 (Mi957)  Stamp and slevedge, from MS25 (897a (25x 897))  2019  New SI base units and fundamental constants logo 
Estonia  897 fdc  Stamp and (pictorial) cancel and cachet on FDC  
Finland  750 (Mi1010)  1987  100th anniv. use of metric system, 1887: Xcross section of standard meter bar  
Finland  750 fdc  Stamp and cachet on FDC  
France  732 (Mi1024)  1954  metric system introduction in France first: allegory  
France  869 fdc (Mi1182 fdc)  (Éditions J.F.) cachet on FDC  1958  "participated in the establishment of the metric system" (in French text) 
France  1435 (Mi1921)  1975  100th anniv. International Metre Convention, 1875: document, krypton atom, waves  
France  1435 fdc1  Stamp and (pictorial) cancel and (Éditions J.F.) cachet on FDC  
France  1435 fdc2  Stamp and (pictorial) cancel and (PJ) cachet on FDC  
France  1435 sc  Souvenir card  
Ghana  570 (Mi630)  1976  introduction of metric system, 197509: liter, water  
Ghana  571 (Mi631)  introduction of metric system, 197509: kilogram, jam  
Ghana  572 (Mi632)  introduction of metric system, 197509: meter, cloth  
Ghana  573 (Mi633)  introduction of metric system, 197509: (°C) fever thermometer, ice, boiling tea kettle  
Guinea Republic  BL1696  In (upperright) margin of SS1  2009  "SI system of units"; also Blaise Pascal 
Guyana  437a (Mi726)  From MS6 (437 (af)) (BL11)  1982  conversion to metric system, 19820102: tape measure, truck 
Guyana  437b (Mi727)  conversion to metric system, 19820102: juggler, unit symbols (°C)  
Guyana  437c (Mi728)  conversion to metric system, 19820102: man, envelope  
Guyana  437d (Mi729)  conversion to metric system, 19820102: woman, baby, scale  
Guyana  437e (Mi730)  conversion to metric system, 19820102: Canje bridge (530 m long)  
Guyana  437f (Mi731)  conversion to metric system, 19820102: liter bucket  
Guyana  557a (Mi870)  From MS6 (557 (af)), 437 (af) overprinted (BL12)  1982  conversion to metric system, 19820102: tape measure, truck 
Guyana  557b (Mi871)  conversion to metric system, 19820102: juggler, unit symbols (°C)  
Guyana  557c (Mi872)  conversion to metric system, 19820102: man, envelope  
Guyana  557d (Mi873)  conversion to metric system, 19820102: woman, baby, scale  
Guyana  557e (Mi874)  conversion to metric system, 19820102: Canje bridge (530 m long)  
Guyana  557f (Mi875)  conversion to metric system, 19820102: liter bucket  
Hungary  2418 (Mi3115)  1976  100th anniv. introduction of metric system, 1876: Xcross section standard meter bar, meter act  
Hungary  2419 (Mi3116)  100th anniv. introduction of metric system, 1876: standard kilogram cylinder  
Hungary  2420 (Mi3117)  100th anniv. introduction of metric system, 1876: interferometer, rocket  
Italy  1809 (Mi2147)  1990  55th anniv. metric system in Italy, 1935: MKS, Giovanni Giorgi  
Japan  673 (Mi705)  1959  adoption of metric system: measuring glass, tape measure, scales  
Japan  673 fdc1  Stamp and (pictorial) cancel and (Watanabe) cachet on FDC, also insert  
Japan  673 fdc2  Stamp and (pictorial) cancel and (?) cachet on FDC  
Japan  673 fdc3  Stamp and (pictorial) cancel and (?) cachet on FDC  
Japan  673 fdc4  Stamp and (pictorial) cancel and (?) cachet on postcard FDC  
Japan  673 fdc5  Stamp and (pictorial) cancel and (?) cachet on FDC  
Japan  673 fdc6  Stamp and (pictorial) cancel and (JPS) cachet on FDC  
Kenya, Uganda, and Tanzania  225 (Mi213)  1971  conversion to metric system: kilogram/pounds, pan balance  
Kenya, Uganda, and Tanzania  226 (Mi214)  conversion to metric system: two (°C/°F) thermometers  
Kenya, Uganda, and Tanzania  227 (Mi215)  conversion to metric system: liters, petrol  
Kenya, Uganda, and Tanzania  228 (Mi216)  conversion to metric system: kilometers, surveyors  
Kenya, Uganda, and Tanzania  225228 fdc1  Four stamps and (East African Posts and Telecommunications) cachet on FDC (Nairobi Stamp Bureau cancel)  conversion to metric system  
Kenya, Uganda, and Tanzania  225228 fdc2  Four stamps and (East African Posts and Telecommunications) cachet on FDC (Nairobi cancel)  
Korea (South)  428 (Mi416)  1964  introduction of metric system: metric unit symbols ("kg" incorrectly given as "Kg")  
Korea (South)  2546 (Mi3380)  From MS16 (MS16 (16x 2546))  2019  New SI base units and fundamental constants logo 
Korea (South)  2546 fdc  Stamp(s) and (pictorial) cancel(s) on FDC  
Korea (South)  2546 folder  FDC folder  
Mexico  C241 (Mi1077)  1957  100th anniv. adoption of metric system, 1857: measures, globe  
Mexico  2967 (Mi?)  2015  125th anniv. acceptance of Treaty of the Meter in Mexico, 1890: measures, globe  
Mexico  2967 fdc1  Stamp and (pictorial) cancel and (purple and black printed) cachet (design like stamp) on FDC  
Mexico  2967 sc  Souvenir card (2967)  
New Zealand  594 (Mi677)  1976  metric conversion, 1976: symbolic measures: weight, length, temperature (unscaled) thermometer  
Nigeria  394 (Mi377)  1980  World Standards Day: kilogram scale, centimeter ruler, emblem  
Pakistan  364 (Mi367)  1974  introduction of metric system: metric measures  
Poland  None  Postal card  1979  60th anniv. Measurement Service, 1919: standards, SI units 
Poland  None  Postal card  2019  100th anniv. Measurement Service, 1919: SI units 
Romania  1873 (Mi2533)  1966  100th anniv. introduction of metric system, 1866: derivation meter  
Romania  1874 (Mi2534)  100th anniv. introduction of metric system, 1866: metric unit symbols  
Russia  8037 (Mi2713)  From MS9 (8037a (9x 8037))  2019  "International system of units" (in Cyrillic text); new SI base units and fundamental constants logo (in FDC cachet) 
Russia  8037 fdc  Stamp and (pictorial) cancel and cachet on FDC  
Singapore  316 (Mi322)  1979  introduction of metric system: distance, kilometer  
Singapore  317 (Mi323)  introduction of metric system: tape measure, centimeter  
Singapore  318 (Mi324)  introduction of metric system: scale, kilogram  
Singapore  316318 fdc  Three stamps and cachet on FDC  introduction of metric system  
Slovenia  Unknown (Mi?)  2019  New SI base units and fundamental constants logo  
Slovenia  Unknown fdc  Stamp and (pictorial) cancel and cachet on FDC  
South Africa  497 (Mi534)  1977  introduction of metric system: world map, "M": 10th anniv. Metric Advisory Board, 1967  
South Africa  497 fdc  Stamp and (pictorial) cancel and cachet on FDC  
Sri Lanka  Unknown+label (Mi?+label)  Label with stamp  2019  "World Metrology Day  2019" (New SI base units and fundamental constants logo) 
Sri Lanka  Unknown+label fdc  Label with stamp and (text) cancel and (Sri Lanka Post) cachet on FDC  
Tonga  449 (Mi?)  1975  introduction of metric system: decade of progress  
United States  None  (MSFC Station) cancel on cover (Colorano silk cachet)  1985  USMANASA Metric Conference, Huntsville AL 
United States  None  (MSFC Station) cancel on cover (USMA/MSFC cachet)  1985  USMANASA Metric Conference, Huntsville AL 
United States  None  (MSFC Station) cancel on cover (red and blue printed cachet)  1985  USMANASA Metric Conference, Huntsville AL 
United States  None  (MSFC Station) cancel on cover (red and blue printed cachet, different)  1985  USMANASA Metric Conference, Huntsville AL 
United States  None  (MSFC Station) cancel on cover (blank/no cachet)  1985  USMANASA Metric Conference, Huntsville AL 
United States  None  (MSFC Station) cancel on cover (blue printed cachet)  1985  USMANASA Metric Conference, Huntsville AL 
Yugoslavia  1180 (Mi1538)  1974  100th anniv. introduction of metric system, 1874: measure  
100th Anniversary of the International Metre Convention (1875 — 1975)  
Bulgaria  2236 (Mi2381)  1975  100th anniv. International Metre Convention, 1875: standard kilogram cylinder, Xcross section standard meter bar  
Bulgaria  2236 fdc  Stamp and (text) cancel and cachet on FDC  
Indonesia  941 (Mi809)  1975  100th anniv. International Metre Convention, 1875: Xcross section standard meter bar, standard kilogram cylinder, globe  
Indonesia  941 fdc  Stamp and (pictorial) cancel and cachet on FDC  
Korea (South)  975 (Mi979)  1975  100th anniv. International Metre Convention, 1875: metric unit symbols  
Netherlands  531 (Mi1056)  1975  100th anniv. International Metre Convention, 1875: symbolic scale  
Norway  655 (Mi704)  1975  100th anniv. International Metre Convention, 1875: Ole Jacob Broch  
Romania  2547 (Mi3263)  1975  100th anniv. International Metre Convention, 1875: emblem  
Romania  2547 fdc  Stamp and (text) cancel and cachet on FDC  
Russia (USSR)  4304 (Mi4337)  1975  100th anniv. International Metre Convention, 1875: metric unit symbols  
Russia (USSR)  4304 cover (Mi4337 cover)  Stamp and (pictorial) cancel and cachet on cover  1975  100th anniv. International Metre Convention, 20 May 1875 
Surinam  421 (Mi695)  1975  100th anniv. International Metre Convention, 1875: symbolic design  
Surinam  422 (Mi696)  
Surinam  423 (Mi697)  
Sweden  1121 (Mi903)  1975  100th anniv. International Metre Convention, 1875: tape measure  
Sweden  11211123 fdc1  One of three stamps and cachet on FDC, also insert  
Sweden  11211123 fdc2  One of three stamps on FDC (different), also insert  
Switzerland  599 (Mi1046)  1975  100th anniv. International Metre Convention, 1875: Xcross section standard meter bar, krypton spectrum  
Switzerland  599 fdc  Stamp and cachet on FDC  
Switzerland  599602 fdc  One of four stamps on FDC 
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