Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1029:
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 120×87-90mm, proof of 4k with two paper folds, 6k has tiny marginal thin, otherwise VF and extremely rare in complete set, Est. $2,500-$3,000, Scott #4579-85
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