Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 167:
1973, Progress in Electronics, 8c multicolored, left sheet margin single with tan (background) and lilac colors omitted, full OG, NH, VF, according to Scott Errors Cat. only 50 stamps are known to exist, C.v. $600, Est. $250- $300, Scott #1501b
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