Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1141:
1918, inverted black overprint (type 48) on perforated 3.50r maroon and green, right sheet margin block of four, full OG, NH, VF and scarce multiple, ex-Dr. Zelonka, C.v. $220 as hinged singles, Est. $150-$180, Bulat #2071a
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