Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 791:
1913, Elizabeth Petrovna, 50k brown and slate, top sheet margin vertical pair, top stamp with double perforation at sides and at the top, full OG, NH (error) or LH, VF and rare pair, Est. $250-$300, Scott #99, var
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