Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1

United States - Air Post stamps

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Start price: $1,000

Buyer's premium:

1990, Tropical Coast, 45c multicolored, top left corner sheet margin plate No.A1111 block of 16 (4×4), four pairs of the block are partly imperforated due to foldover, including pair imperforated horizontally, pair imperforated at top and between stamps and two pairs imperforated at top, all with diagonal perforation lines, full OG, NH, VF and reportedly unique item, Est. $1,600-$2,000, Sc. # C127, a