Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1264:
1918, violet overprint (type 1) on 23 perforated (one pair) and 20 imperforate stamps, all are errors – representing 28 inverted and 14 doubled overprints, most with full/part of OG, mostly VF, important stamps are expertized, not all are priced in the catalog, Est. $300-$400, Bulat#13/48 var
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