Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1300:
1931-32, Airships, 10k-1r, imperforate and perforated (L12½) complete sets of five, in addition 15k engraved stamp with perforation 12½, full OG, NH, mostly VF, C.v. $700, Scott #C15-19, C20-25
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