Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 951:
1924 (May 7), 20k red and black, horizontal pair with narrow frame, used on registered philatelic exchange cover from Kharkov to Montreal, uprated by three black surcharges 1k/1r brown with buff network (two – on reverse), perf 12½, tied by red boxed 7-line official cachet, arrival ds is on reverse, VF and very scarce, Est. $300-$400, Scott #268 var
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