Great Britain 1840 1d black, plate 1a, SG2 - penny black second day of issue cover.
May 7th, 1840, the second day of issue, lettersheet sent from Keswick to London bearing a 1d black plate 1a lettered "TK" with very large margins, with Maltese Cross cancellation, and Keswick circular date stamp "MY 7 1840" on front.
A beautiful exhibition quality display cover bearing the world's first postage stamp marking the dawn of prepaid postage and spawning a communications revolution.
This is the first time this cover has appeared on the market in over 50 years.
Accompanied with a 1994 Royal Philatelic Society (RPS) Certificate of Authenticity.
