The Volokolamsk RSFSR and Soviet Union Specialized Collection, Various Russian Stamps and Covers of other owners
Lot 45:
1913, Elizabeth Petrovna, imperforated large die proof of 50k in black, printed on chalk-surfaced thin paper, size 38x46mm, small thin at top left corner, nevertheless VF, proofs of 50k are very rare, especially in black, Est. $1,000-$1,300, Scott #99
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