Repository for many Crypto Stamps. (NOT OFFICIAL) Here you find some data/information about the Crypto stamp CS1 and CS2, but also many more for example the UN Crypto Stamp.
austrian CS website is https://crypto.post.at UN CS website is https://crypto.unstamps.org/ croatian CS website is https://kripto.posta.hr/marka/
telegram group: german https://t.me/crypto_stamps or english https://t.me/cryptostampenglish
Bitcointalk: german https://bitcointalk.org/index.php?topic=5245981.0 or english https://bitcointalk.org/index.php?topic=5153959.0