Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 2109:
1918, inverted black trident overprint (type 10) on 7k light blue, full OG, previously hinged, VF and rare, the stamp is listed, but not priced in the Catalog, expertized by J. Bulat, Bulat #1346
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