Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 3
Lot 1456:
1918-20, inverted black surcharge 1r on perforated 3k red, complete sheet of 100 (25 x4), watermark Wavy Lines at left selvage, minor perf separation between stamps and gutter of the top left pane, some marginal creases as always, full OG, NH, VF and rare error in a complete sheet, C.v. $5,000++, Est. $800-$1,200, Sc. # 24a
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