| Country | Catalog Number | Type of Item | Year of Issue | Notes on Content |
|---|
| Standard time and time zones |
|---|
| Argentina | 1314 (Mi1522) | | 1981 | 100th anniv. Naval Observatory, 1881: 24 time zones |
| Antigua and Barbuda | 920 (Mi930) | | 1986 | Old Greenwich Observatory |
| Antigua and Barbuda | 973 (Mi978) | 920 overprinted with Halley's Comet logo | 1986 | Old Greenwich Observatory |
| Ascension Island | 386 (Mi395) | | 1986 | Old Greenwich Observatory |
| Barbuda | 787 (Mi893) | Antigua and Barbuda 920 overprinted "Barbuda Mail" | 1986 | Old Greenwich Observatory |
| Canada | None | (Multi-color printed) cachet on cover | 2004 | "Canada summer time zones" |
| Fiji | 183 (Mi?) | | 1962 | "180° meridian - International Date Line" |
| Fiji | 283 (Mi?) | | 1969 | Map of Fiji: "180° - International Date Line" |
| Great Britain | None | Postcard back | ~1902 |
(Old) "Royal Observatory, Greenwich" |
| Great Britain | None | (Pictorial) cancel | 1973 | "Greenwich Day" (3 May 1973) |
| Great Britain | 742 (Mi675) | | 1975 | (300th anniv.) Old Greenwich Observatory |
| Great Britain | 742 maxi | Maxicard
|
| Great Britain | 1058 (Mi993) | | 1984 | 100th anniv. Greenwich Meridian, 1884: prime meridian (in red), (Apollo-11 ?) satellite view |
| Great Britain | 1059 (Mi994) | | 100th anniv. Greenwich Meridian, 1884: prime meridian (in red), English Channel map |
| Great Britain | 1060 (Mi995) | | 100th anniv. Greenwich Meridian, 1884: prime meridian (in red), Greenwich observatory |
| Great Britain | 1061 (Mi996) | | 100th anniv. Greenwich Meridian, 1884: prime meridian (in red), George Airy's transit telescope |
| Great Britain | 1058-1061 fdc1 | Four stamps and (Royal Mail) cachet on FDC (Edinburgh cancel) | (As above for stamps) |
| Great Britain | 1058-1061 fdc2 | Four stamps and (Greenwich) cancel and (Royal Mail) cachet on FDC
|
| Great Britain | 1058-1061 fdc3 | Four stamps and (London) cancel and (Royal Mail) cachet on FDC
|
| Great Britain | 1061 fdc1 | Stamp and (London) cancel and (Benham) cachet on FDC
|
| Great Britain | 1061 fdc2 | Stamp on FDC
|
| Great Britain | 1133-1136 fdc1 (Mi1060-1063 fdc1) | (Benham) cachet on FDC, also detail | 1986 | "Old Royal Observatory Greenwich", with Flamsteed House at the right |
| Great Britain | 1133-1136 fdc2 (Mi1060-1063 fdc2) | (Benham) cachet (different) on FDC, also detail
|
| Great Britain | 1338 (Mi1298) | | 1990 | (One tower of) Old Greenwich Observatory |
| Great Britain | 1338 card | PHQ card
|
| Great Britain | 1336-1339 fdc1 | One of four stamps on FDC (Cotswold and Stuart / BPCPA cachet, Greenwich cancel)
|
| Great Britain | 1336-1339 fdc2 | One of four stamps on FDC (Mercury cachet; Greenwich cancel, different), also back
|
| Great Britain | 1336-1339 fdc3 | One of four stamps on FDC (Mercury cachet; Armagh cancel), also back
|
| Great Britain | 1336-1339 fdc4 | One of four stamps on FDC (Royal Mail cachet, Brighton, East Sussex cancel)
|
| Great Britain | 1336-1339 fdc5 | One of four stamps on FDC (Royal Mail cachet, Northampton cancel)
|
| Great Britain | 1336-1339 fdc6 | One of four stamps and (Benham) cachet on FDC (Armagh, N. Ireland cancel)
|
| Great Britain | None | (Pictorial) cancel | 2002 | (Upper part of) Old Greenwich Observatory |
| Isle of Man (Great Britain) | 850 | In (lower-left) margin of MS3 (805 (a-c)) | 1999 | "Greenwich Meridian 2000" logo |
| Isle of Man (Great Britain) | 850 fdc | MS3 on FDC
|
| Isle of Man (Great Britain) | 850 folder | Folder
|
| Isle of Man (Great Britain) | KM1051 | 1 crown (silver coin) | 2000 | Old Royal Observatory clock face with embedded brass strip from original Prime Meridian |
| Ivory Coast | Unknown ss (BL none) | In (upper-right) margin of SS1 [known illegal issue] | 2012 | Old Greenwich Observatory |
| Ivory Coast | Unknown b (Mi?) | One of MS2 (a-b) | 2016 | Old Greenwich Observatory |
| Ivory Coast | Unknown fdc1 | MS2 on FDC
|
| Ivory Coast | Unknown fdc2 | MS2 on FDC (different)
|
| Ivory Coast | Unknown ms (Mi none) | In (lower-right) margin of MS2 (a-b), also detail [known illegal issue] | 2017 | Old Greenwich Observatory |
| Ivory Coast | Unknown ms fdc | MS2 on FDC
|
| Japan | 732 (Mi771) | | 1961 | 75th anniv. Japanese standard time, 1886: Sun, Earth, meridian |
| Japan | 1676 (Mi1687) | | 1986 | 100th anniv. Japanese standard time, 1886: meridian, clock, outline |
| Kiribati | 421 (Mi420) | | 1983 | Map of Kiribati: International "Date Line" |
| Kiribati | None | Stampcard of 6 | ? | "International Date Line" |
| Kiribati | None | Stampcard of 6 (different value)
|
| Korea (North) | 2402 (Mi2495) | | 1984 | 100th anniv. Greenwich Mean Time, 1884: clock face |
| Korea (North) | 2403 (BL183, Mi2496) | SS1
|
| Korea (North) | Unknown (Mi6254) | From MS9 (9x single) | 2016 | Implementation of "Pyongyang [Standard] Time" zone for North Korea; clock face |
| Korea (North) | Unknown fdc | Stamp and (text) cancel and (red and blue printed) cachet on FDC
|
| Liberia | KM443 | $10. (silver coin) | 2000 | "Greenwich Meridian" |
| Mali | Unknown a (Mi none) | One of MS2 (a-b) [known illegal issue] | 2018 | "Observatoire royal de Greenwich", and 24-h clock |
| New Zealand | 1628 (Mi1813) | From MS10 (1628a (10x 1628)) | 2000 | Year 2000: International Date Line: world map, Sun |
| New Zealand | None | Postcard back, also front | 2008 | "140 years GMT" (in text on front); "First country to adopt Greenwich Mean Time" |
| Nicaragua | 1985f (Mi3297) | One of MS16 (1985 (a-p)) (Mi3292-3307) | 1994 | Greenwich Observatory |
| Niuafo'ou (Tonga) | 46 (Mi46) | | 1984 | 100th anniv. International Date Line, 1884: South Pacific map |
| Niuafo'ou (Tonga) | 46 specimen | Overprinted "specimen"
|
| Niuafo'ou (Tonga) | 46+label1 | Overprinted "specimen" and gutter label1
|
| Niuafo'ou (Tonga) | 46+label2 | Overprinted "specimen" and gutter label2
|
| Niuafo'ou (Tonga) | 46 proof | Black-and-white proof
|
| Niuafo'ou (Tonga) | 47 (Mi47) | | 100th anniv. International Date Line, 1884: globe, map |
| Niuafo'ou (Tonga) | 47 specimen | Overprinted "specimen"
|
| Niuafo'ou (Tonga) | 47+label1 | Overprinted "specimen" and gutter label1
|
| Niuafo'ou (Tonga) | 47+label2 | Overprinted "specimen" and gutter label2
|
| Niuafo'ou (Tonga) | 47 proof | Black-and-white proof
|
| Niuafo'ou (Tonga) | 46-47 fdc | Two stamps and (pictorial) cancel and (black printed) cachet on FDC | (As above for stamps) |
| Palau | 568 (Mi1745-1750) | MS6 (568 (a-f)) | 2000 | Millennium: 24 time zones |
| Tonga | 586 (Mi896) | | 1984 | 100th anniv. International Date Line, 1884: George Airy, Greenwich Meridian pioneer |
| Tonga | 586 proof1 | Black-and-white proof
|
| Tonga | 586 proof2 | Chromalin proof
|
| Tonga | 586 specimen | Overprinted "specimen"
|
| Tonga | 586 specimen+label | Overprinted "specimen" and gutter label
|
| Tonga | 587 (Mi897) | | 100th anniv. International Date Line, 1884: Sanford Fleming, time zone pioneer |
| Tonga | 587 proof1 | Black-and-white proof
|
| Tonga | 587 proof2 | Chromalin proof
|
| Tonga | 587 specimen | Overprinted "specimen"
|
| Tonga | 587 specimen+label | Overprinted "specimen" and gutter label
|
| Uganda | 1658m (Mi2261) | One stamp and in (left) margin of MS17 (1658 (a-q + label)) (Mi2249-2265) | 2000 | Millennium: Highlights, 1850-1900: world time zones establishment |
| Wallis and Futuna Islands | C177 maxi (Mi659 maxi) | (La Numismatique française) cachet on maxicard, also back | 1994 | International Date Line and selected time zones |
| Gregorian calendar |
|---|
| Germany (West) | 1383 (Mi1155) | | 1982 | 400th anniv. Gregorian Calendar, 1582: calendar illumination |
| Vatican City | 715 (Mi811) | | 1982 | 400th anniv. Gregorian Calendar, 1582: surveying the globe |
| Vatican City | 716 (Mi812) | | 400th anniv. Gregorian Calendar, 1582: edict of reform |
| Vatican City | 717 (Mi813) | | 400th anniv. Gregorian Calendar, 1582: presenting edict |
| Vatican City | 717a (BL4) | MS3 (715-717) | 400th anniv. Gregorian Calendar, 1582 |
