Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1525:
1918, black overprint (type 56) on imperforated 7r green and pink in horizontal pair, cancelled on a piece by Dunaivtsi date stamps, perforated 50k with trident of type 1 is on reverse, VF and scarce, Bulat #2189, C.v. $450++, Est. $250-$300
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