Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 547:
1985, Lawrence and Elmer Sperry, 39c multi, bottom margin vertical imperforated pair, full OG, NH, VF and rare, according to Scott Errors Cat. only 25 pairs reported, C.v. $1,250, Est. $600-$700 , Sc. #C114a
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