Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 1333:
1906, black overprint ”O.B.” on definitive stamps of 2c-30c, complete set of ten, 3 with sheet margins, the high value with natural straight edge at left, full OG, NH, fine and very scarce, Est. $300- $350, Scott #241-50 var
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