Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1273:
1918, green overprint (type 1) and black overprint (type 2) on left and right stamps of perforated horizontal pair 20k blue and red, full OG, NH, VF and a spectacular item, ex-Dr. Zelonka, C.v. $525 for single stamps, Est. $300-$400, Bulat #121-39
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