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Lot # 615 | P | Scott # 1994
| 1957, All-Union Industrial Exhibition, Tractor "DET 250", unissued design and denomination of 1r in bluish green, perforation L12 1/2 partially separated by scissors, gummed, VF and extremely rare, in various Russian Specialized Cats these stamps without perforation and mounted on cards are considered to be proofs . |