Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1415:
1918, black overprint (type 44) on two perforated stamps of 25k green and violet, one has double overprint, postally used, mostly VF, expertized by J. Bulat, both values are priced with ”-” in the Cat., Bulat #2010, a
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