The Volokolamsk RSFSR and Soviet Union Specialized Collection, Various Russian Stamps and Covers of other owners
Lot 26:
1913, Peter the Great, imperforated large die proof of 4k in black, printed on chalk-surfaced thin cardboard, size 45x60mm, VF and very rare, proofs in black were printed in very small quantity, Est. $1,200- $1,400, Scott #91
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