Bidspirit auction | Soviet Union - Die Proofs

Soviet Union - Die Proofs Selection - 1977, Soviet Icebreakers, 4k-20k, complete set of seven die proofs in indigo, black, brown, blue or violet, artist A. Axamit with group of engravers, each one with printer's markings at sides, approximate size 120x87-90mm, proof of 4k with two paper folds, 6k has tiny marginal thin, otherwise VF and extremely rare in complete set, Est. $2,000-$2,400, Sc. # 4579-85