Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1314:
1918, violet overprint on imperforate 3k red, enlarged margin at top and balanced around, postal cancellation, VF, expertized by A. Popov, the stamp is listed, but priced with ”-” in the Catalog, Est. $300-$400, Bulat#2290
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