Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 1
Lot 271:
1906, black overprint ”O.B.” on definitive stamps of 2c-30c, complete set of ten, full OG (6c – tiny spot of gum skip), NH, fine and very scarce, Est. $250-$300, Scott #241-50 var
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