Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 411:
1983, American Inventors, (20c) x4 multicolored, right sheet margin se-tenant block of four with black engraved color omitted, full OG, NH, VF, C.v. $275, Est. $100-$150 , Sc. #2058b
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