Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1128:
1918, black overprints (type 28) on imperforate 50k, 1r and 7r, all are postally used, mostly VF, ex-Dr. Zelonka, stamps of 50k and 7r either not priced or priced with ”-”, Est. $300-$350, Bulat #1841-43
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