Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1520:
1918, black overprints (type 28) on imperforated 50k, 1r and 7r, all are postally used, mostly VF, ex-Dr. Zelonka, Bulat #1841-43, C.v. $6, stamps of 50k and 7r not priced, Est. $250-$300
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