Bidspirit auction | Soviet Union - Die Proofs

Soviet Union - Die Proofs Selection - 1977, Postal Official and (Sorting Machine), die proof of (4k) in brown representing a part of engraved design (stage proof), artist G. Komlev, engraver I. Mokrousov, size 118x88mm, produced on wove paper without gum, VF and very rare, Est. $300-$400, Sc. # 4621