Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1301:
1918, black overprint (type 10) on perforated 1r brown, pale brown and orange, block of four, neat postal cancellation, mostly VF and scarce multiple, expertized by A. Popov, ex-Dr. Zelonka, this stamp is not listed in the Catalog, Est. $600-$800
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