History of Aviation, Rare Stamps and Postal History of the World, Part 1
Lot 162:
1917, Washington, 2c carmine, type I, horizontal pair imperforated vertically, usual centering, full OG, previously hinged, PF certificate for block of four, this one being the top pair, C.v. $550, Est. $250-$300 , Sc. #499b
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