Bidspirit auction | Soviet Union - Die Proofs

Soviet Union - Die Proofs Selection - 1982, Public Transportation in 19th and 20th Centuries, (4k)-(32k), complete set of six sunken die proofs, engraved part of the design, artist V. Karasev, each one with printer's markings at sides, approximate size 100x120mm, 6k with minor changes compare to issued stamp, printed on stamp gummed paper, traces of hinges, VF and extremely rare, Est. $2,500-$3,000, Sc. # 5001-06