1875 5c red brown and 10c black, plate proofs on card, complete sheets of fifty, each with large outer margins, 5c showing plate scratches between pos. 31 and 41, 5c with minor corner bend and both with few inconsequential adhesions, v.f. and extremely rare exhibition showpiece (Clarence Brazer estimated in his 1947 article that "probably five or six pairs of sheets of 50 plate proofs on cardboard are known") cat. $27000 (Cat No. 3-4P4) (Image)

Cat. $27000, Est.$25,000