Stamps by Countries
It is sometimes difficult to decide whether a stamp is an official issue and thus valid for postage, especially in African and Asian countries. If a stamp is listed in the world-wide accepted and well-known stamp catalogues Michel (MI, Germany), Scott (SC, USA), Stanley-Gibbons (SG, United Kingdom) or Yvert & Tellier (YV, France) it is a real postage stamp for sure. Often these catalogues publish new issues from exotic countries only many years after their issue date.
If it is doubtful whether a stamp is an official issue or not that particular stamp remains listed in the category "Stamps" unless its unauthorized status is proven.
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Stamp GUI 2009 Sept. 2nd - Painting G. Seurat °The Seine at the Isle de la Grande Jatte in Spring° (1887)
Mi 6637 
Mi 6636-49 KB = MS 
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Stamp GUI 2012 Dec. 17th (perforated & imperforated) - gold medal winners at OG London


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Stamp GUI 2012 Dec. 17th (perforated & imperforated) - OG London M4X gold medal winner crew GER
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Stamp GUI 2012 Dec. 17th OG London (perforated & imperforated) - M1X gold medal winner Mahe Drysdale
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Stamp GUI 2012 Dec. 17th perforated & imperforated - LM2X gold medal winners M. Rasmussen & R. Quist (DEN) OG London
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Stamp GUI 2014 Oct. 27th SS - Painting "La Seine à la Grande Jatte - Printemps" (1888) by Georges Seurat
YV BF 1757
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Stamp GUI 2022 "Rowing" (set of 6 - unauthorized issue)
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Stamp GUI 2022 (unauthorized issue) - Painting "John Biglin in a Single Scull" (1874) by Thomas Eakins
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Stamp GUI 2022 OG Paris 2024 (unauthorized issue)
Alexander Vyazovkin (ROC = Russian Olympic Committee)
M1X competition OG Tokyo 5th place
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Stamp GUI 2023 Nov. 29th - Pre-Olympic year OG Paris 2024
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Stamp GUI 2024 - OG Paris


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Stamp GUI 2024 - OG Paris


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Stamp GUI 2024 - OG Paris (single sculler)


MS with single sculler in margin

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Stamp GUI 2024 Oct. 2nd - "Aviron" OG Paris (4X-)

original photo
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Stamp GUY (unauthorized) OG Berlin 1936
The designer took the image of the German stamp 1936 (on the far right) and placed it against a new background.
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Stamp GUY 2000 May 15th OG Sydney - Henry Robert Pearce (AUS), Olympic champion M1X at Amsterdam 1928 and Los Angeles 1932
MI 6975
SC 3498a
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Stamp GUY 2016 July 7th OG Rio de Janeiro "Remembering 120 years of Olympic Games" with Olympic pictogram No. 14
MI 9244
YV 6776
YV 6773-76
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Stamp GUY 2022 (unauthorized issue) - OG Rio de Janeiro (W1X AUS)
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Stamp GUY 2022 (unauthorized issue) - Gold medal winner crew GBR OG Sydney 2000
J. Cracknell (bow), S. Redgrave,
T. Foster, M.Pinsent (stroke)
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Stamp GUY 2022 (unauthorized issue) - OG Beijing 2008 (M4-)
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