Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 3
Lot 1136:
1978, Soviet Icebreakers, 4k-20k, complete set of six sunken die proofs in indigo, black or violet, artist A. Axamit with group of engravers, each one with printer’s markings at sides, full OG with just slight trace of hinges, mostly VF and very rare in complete set, Est. $2,000-$2,400, Sc. #4721-26
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