Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 63:
1930, Zeppelin issue, inverted green with bronze powder surcharge 5c on Aviation School stamp of 10c vermilion and black, full OG, previously hinged, F/VF and very scarce, only 50 stamps were produced with inverted surcharge, C.v. $200, Est. $150-$200, Sc. # C19a
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