The Volokolamsk RSFSR and Soviet Union Specialized Collection, Various Russian Stamps and Covers of other owners
Lot 39:
1913, Alexis Mikhailovich, imperforated large die proof of 25k in black, printed on chalk-surfaced thick paper, size 37x48mm, VF, proofs in black are very rare, especially for 25k denomination, Est. $1,600-$1,900, Scott #97
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