Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1299:
1918, black overprint (type 19) on imperforate 15k and 7r, both with postal cancellations, mostly VF and rare, expertized by J. Bulat, C.v. $225 (7r) and 15k priced with ”-”, Est. $250-$300, Bulat #1698, 17
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