Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1203:
1918, black overprint on imperforate 50k brown violet and green, bottom margin single with neat postal cancellation, VF, ex-Dr. Zelonka, the stamp priced with ”-” in the Catalog, Est. $1150-$200, Bulat #2541
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