Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 361:
1973, Progress in Electronics, (15c) multicolored, left sheet margin single with black engraved color omitted (all inscriptions and denomination), full OG, NH, VF, C.v. $850, Est. $350-$400 , Sc. #1502a
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