Large Die Proofs. 1970, Lenin, stamp of 50k in dark red from the souvenir sheet EXPO' 70 International Exhibition, mirrored text at bottom, printer's markings at four sides, size 89x118mm, minor violet ink splashes, still VF and rare, Est. $300-$400 (Image)

Large Die Proofs. 1976, Dmitry Shostakovich, Composer, 6k in dark violet blue, artist V. Koval, engraver V. Smirnov, printer's markings at four sides, size 89x119mm, no gum as issued, VF, Est. $400-$500 (Image)

Large Die Proofs. 1978, Leo Tolstoy, 4k in red (issued stamp in slate green), artist I. Martynov, engraver I. Mokrousov, size 86x120mm, no gum as issued, VF and probably unique in this color, Est. $500-$600 (Image)

Large Die Proofs. 1978, Stepan Shaumyan, Baku Commissar, 4k in bright green (issued stamp in slate green), artist V. Sorokin, engraver L. Mayorova, printer's markings at four sides, size 88x120mm, no gum as issued, VF and very rare, Est. $400-$500 (Image)

Large Die Proofs. 1980, Alexander Suvorov, Generalissimo, 4k in dark blue (issued stamp in slate blue), artist I. Filippov, engraver L. Mayorova, size 90x105mm, no gum as issued, VF and rare, Est. $400-$500 (Image)

Large Die Proofs. 1980, definitive issue, Soviet Flag, 3k in red (issued color), artist A. Kalashnikov, engravers A. Tkachenko and V. Sayapin, printer's markings at sides, size 87x120mm, no gum, VF, Est. $300-$400 (Image)

Large Die Proofs. 1981, Sergey Prokofiev, Composer, 4k in grey violet (issued color), artist V. Nikitin, engraver M. Silyanova, size 91x119mm, no gum as issued, VF and rare, Est. $400 -$500 (Image)

Large Die Proofs. 1982, Vasily Solovyov-Sedoi, Composer, 4k in brown (close to issued color), artist P. Bendel, printer's markings at sides, size 100x117mm, full OG with trace of hinges, VF and very rare, Est.$400-$500 (Image)

Large Die Proofs. 1983, Aram Khachaturyan, Composer, 4k in violet brown (close to issued color), artist V. Koval, printer's markings at sides, size 120x100mm, no gum as issued, VF and rare, Est.$400-$500 (Image)