Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 2110:
1918, two perforated stamps of 50k violet and green with black overprint (type 10), one of which with inverted overprint, both cancelled on pieces, VF and rare, the last one expertized by J. Bulat, ex-Dr. Zelonka, C.v. $385, Bulat #1351, a
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