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: $750

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 imperforate due to foldover, including pair imperforate horizontally, pair imperforate at top and between stamps and two pairs imperforate at top, all with diagonal perforation lines, full OG, NH, VF and reportedly unique item, Est. $1,500-$2,000, Scott #C127, a