Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1066:
1918-20, black surcharge ”-1r.” on perforated and imperforated 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 and scarce, Est. $150-$200, Scott #23, 38, var
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