Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 322:
1919-20, black surcharge 10r on imperforate 3k red, and four black, red and violet surcharges 15r on imperforate 1k orange, including two stamps with inverted surcharge (not listed in SG), all with full OG, LH or cancelled on a piece (No.23), VF, various experts’ signs and guaranteed genuine, C.v. approximately $1,500, SG #19/20, a,b, var, Scott #21-24, 23a
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