Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1122:
1918, inverted black overprint (type 18) on 3.50r maroon and green, right sheet margin block of four, lower left stamp has double inverted overprint, full OG, NH, VF and a spectacular item, C.v. $80 as four hinged singles with inverted overprint, Est. $150-$180, Bulat #1674a, var
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