Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 2035:
1918-20, black surcharge ”-1r.” on perforated and imperforate 3k red, two top sheet margin blocks of four, stamps of upper row with a comma instead of a dot variety, full OG, NH, VF, this error is not listed in Scott, Est. $150-$200, Scott #23, 38 var
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