Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 2117:
1918, black overprint (type 24) on 7k light blue, two perforated stamps canceled on a piece with complete Kalinovka postal marking, VF and rare, ex-Dr. Zelonka, the stamp is priced with ”-” in the Cat., Bulat #1779
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