Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1046:
1918-20, black surcharge ”-1r.” on perforated and imperforate 3k red, two top sheet margin blocks of four, stamps from upper row with a comma instead of a dot surcharge variety, in addition corner margin horizontal pair with double surcharge, full OG, NH, VF, Est. $200-$250, Scott #23, 38 var
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