Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1163:
1918, black or brown (3.50r) overprint (type 3b) on imperforated 1k-7r, set of 11 (less 5r for completion), full OG, mainly LH, VF, some signed by experts, ex-Dr. Zelonka, C.v. $306, Bulat #633/44
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