Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1047:
1918-20, inverted black surcharge 1r on perforated 3k red, complete pane of 25, full OG, NH, VF and scarce multiple, C.v. $1,250 as hinged singles, Est. $400-$500, Scott #24a
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