Bidspirit auction | Soviet Union - Die Proofs

Soviet Union - Die Proofs Selection - 1977, Postal Official and Mail Delivery, die proof of 4k in brown (issued in brown and black), engraved part of the design, artist G. Komlev, engraver I. Mokrousov, printer's markings at sides, size 118x87mm, produced on wove paper without gum, VF and very rare, Est. $300-$400, Sc. # 4623