Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1156:
1918, gray black instead of violet overprint (type 1) on perforated 1k orange, side margin horizontal strip of five, perf reinforcement, full OG, NH (1) or hinged, VF, C.v. $250 as singles, Bulat #13b
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