Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 2095:
1918, double black overprints (type 1) on imperforate 5k and 15k, enlarged margins, unused, no gum, VF and scarce, each expertized by J. Bulat, this variety is not mentioned in the Cat., C.v. $205 for common stamps, Bulat #1005-06 var
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