Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 260:
1973, Progress in Electronics, (15c) multicolored, a single with black engraved color omitted (all inscriptions and denomination), full OG, NH, F/VF, C.v. $850, Est. $350-$400, Sc. # 1502a
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