Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1

United States - Modern Errors

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Start price: $500

Buyer's premium:

1987, Pan American Games, (22c) multi, silver color omitted, bottom left corner sheet margin ZIP block of four, usual centering, full OG, NH and probably unique multiple, a copy of APEX certificate for pane of 50, C.v. $2,200, Est. $800-$1,000 , Sc. #2247a