Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 792:
1913, Elizabeth Petrovna, imperforated large die proof of 50k in dark ultra, printed on chalk-surfaced thick paper, size 39x47mm, previously hinged, no thins or any hidden defects, VF, proofs of 50k are very rare especially in ultramarine, Est. $1,200-$1,600, Scott #99
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