Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1301:
1931, Airships, 10k violet in block of six, 20k carmine in block of four, 20k pale red in block of six, all with comb perforation, 50k brown, two blocks of four with line and comb perf, 1r dark green in block of six, comb perforation, full OG, NH, VF, C.v. $520 as singles, Scott #C20/24, var
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