Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1093:
1918, violet overprint (type 1) over black surcharge 20(k) on Romanov Dynasty 14k blue green, horizontal pair, left stamp has inverted overprint, Kyiv cancellation, VF and scarce tete-beche pair, expertized by J. Bulat and U.P.V., C.v. $175 for singles with common and inverted overprints, Est. $200-$250, Bulat #59, a
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