Soviet Union - Large Die Proofs

Soviet Union - Large Die Proofs
1977, Olympic Games in Moscow, Tourism around the ''Golden Ring'', sunken die proofs of engraved part of the designs of (1r+50k) in black, the first issue, complete set of six, artist L. Sharov, approximate size 97-99x117- 118mm, printer's markings at sides, printed on gummed paper with trace of hinges, VF and extremely rare, especially in complete set, Est. $2,000-$3,000, Scott #B107-12