Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 81:
1925, inverted black surcharge 25(c) on 1c chocolate, full original typical dry gum with minor foxing, VF and rare, only 12 stamps were produced with inverted surcharge, expertized by A. Roig and others, C.v. $700, Est. $400-$500 , Sc. #C10a
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