Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 947:
1924 (March 13), 6k red and black, horizontal pair with medium frame, red color strongly shifted to the top, used together with peasant 2k green, imperforate block of four on cover to Germany, no arrival ds as often, mostly VF and scarce variety on cover, Est. $200-$250, Scott #268 var
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