Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 847:
1980, Research Fleet, 2k-15k, complete set of six sunken die proofs in black, artist A. Axamit with group of engravers, size 118-120×98-100mm, each one with printer’s markings at sides, printed on stamp gummed paper, 15k with tiny marginal thin, all with traces of hinges, mostly VF and extremely rare in complete set, Est. $2,500 -$3,000, Scott #4881-86
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