Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 28:
1930, Graf Zeppelin surcharge and overprints on Aviation School stamps, 5c/10c, 10c-1b, set of six values, full OG, NH (3) or LH/hinged, mostly VF, C.v. $450, Est. $250-$300, Scott #C11-12, C14-16, C18
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