Now showing: Guyana - Postage stamps (1966 - 2024) - 1 stamps.
15. říjen WM: 3 Perforation: 13½
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![[The 100th Anniversary of Robert Koch's Discovery of Tubercle Bacillus - Issue of 1980 Overprinted "Dr. R. KOCH CENTENARY TBC BACILLUS DISCOVERY", type OS]](https://swmedia-4cd6.kxcdn.com/media/catalogue/Guyana/Postage-stamps/OS-s.jpg)
