Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1121:
1918, black overprint (type 16) on perforated 5k-3.50r, set of eight postally used values, mostly VF, C.v. $470, expertized by J. Bulat and U.P.V., Est. $250-$300, Bulat #1620/30
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