Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1072:
1913, Elizabeth Petrovna, die proof of 50k in dark ultra, printed on chalk-surfaced thick paper, size 39x47mm, previously hinged, no thins or any hidden defects, VF and rare, Est. $800-$900, Scott #99
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