Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 262:
OFFICIAL STAMPS: 1906, red overprint ”O.B.” on definitive stamps of 2c-30c, complete set of ten, three stamps with sheet margin, full OG, NH, fine and rare, Est. $400-$500, Scott #241-50 var
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