Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1400:
1918, black overprint (type 20) on perforated 15k violet brown and blue, a part of postal cancellation, VF and rare, ex-Faberge, expertized by J. Bulat, the stamp priced in the Cat. with ”-”, Bulat #1706
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