The British Guiana One-Cent Magenta was displayed in a glass case at Sotheby's in New York on June 17, 2014.
Notes on verification
Auction date and location fully confirmed by Sotheby's listing and independent news sources. The specific detail of a 'glass case' is corroborated indirectly via NPR photo caption describing a protective case, but no source uses the exact phrase 'glass case.' [tier=silver indep_score=0.833 clusters=3 claim_tier=notable]
Sources
- Rare British Guiana 1c Magenta stamp to go on display (seed:culture_and_philosophy)
- https://www.sothebys.com/en/auctions/2014/magenta-n09154.html (corroboration)
- https://www.npr.org/sections/thetwo-way/2014/06/18/323210877/the-twisty-tale-of-the-world-s-most-expensive-stamp (corroboration)
- https://guyanastamps.com/2014/06/18/british-guiana-1c-magenta-sells-for-9-48m-usd/ (corroboration)