History of Aviation, Rare Stamps and Postal History of the World, Part 3
Lot 1345:
1918, inverted violet overprint (type 1) on perforated 2k-70k and imperforated 2k and 3k, nice and fresh, full/part of OG or unused on gum (5k), VF, stamps of 3k perf and 2k imperf are not listed in the Cat., ex-Dr. Zelonka and Dr. Seichter, Est. $150-$200, Bulat #943a/64a
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