Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 2108:
1918, two perforated stamps of 10r with black overprint (type 9), both are postally used, stamp cancelled on a piece has background strongly shifted to the left, mostly VF, expertized by U.P.V., J. Bulat and others, C.v. $450++, Bulat #1325, a
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