Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 302:
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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