Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 360:
1973, Progress in Electronics, 8c multicolored, a single with tan (background) and lilac colors omitted, full OG, NH, VF, Datz mentioned that only 50 stamps exist, C.v. $600, Est. $250-$300 , Sc. #1501b
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