1955, Konstantin A. Savitsky, 40k x4 multicolored, set of two souvenir sheets with black and red marginal inscription, both with the second line of the top inscription shifted to the left (''K'' to the left of ''let''), full OG, NH, VF, a common set of sheets is included for comparison, Est. $300-$400 (Image)

1955, Moscow University, 40k multicolored, perforation L12 1/2 instead of comb 12 1/2x12, right sheet margin block of six (2x3), full OG, NH, VF, each stamp with Soviet Philatelic guarantee hs on reverse, Est. $140-$180 (Image)

1955, Moscow University, 1r multicolored, perforation L12 1/2 instead of comb 12 1/2x12, nicely centered and post office fresh, full OG, NH, VF and scarce, Raritan Stamps guarantee, Est. $1,800-$2,200 (Image)

1956, Academician Alexei N. Krylov, 40k gray, brown and black, perforation L12 1/2 instead of comb 12x12 1/2, nice and fresh quality, spotted full original gum as always exists (much better looking then usual), NH, VF and rare, N. Mandrovski certificate, Est. $2,000-$2,500 (Image)

1956, Khachatur Abovian, Armenian Writer, 40k brown black on bluish paper, perforation L12 1/2 instead of comb 12x12 1/2, bottom sheet margin unfolded block of four, full OG, NH, VF, Est. $120-$150 (Image)

1956, Sergey M. Kirov, Soviet Politician, 40k multicolored, a single with perforation L12 1/2 instead of comb 12x12 1/2, full OG, NH, VF and scarce, N. Mandrovski certificate mentioned two places of disturbed gum, which we did not find on that stamp, Est. $1,800-$2,200 (Image)

1956, Builder's Day, 1r intense blue, comb perforation 12x12 1/2 instead of L12 1/2, full OG, NH, F/VF centering, Est. $120-$150 (Image)

1957, Youth Festival, 10k-1r, imperforated complete set of five, most with sheet margins, full OG, NH, VF, C.v. $300, Est. $150-$200 (Image)

1957, Vologda Lace Maker, 40k rose, orange and brown, perforation L12 1/2 instead of comb 12x12 1/2, full OG, NH, VF, Est. $120-$150 (Image)

1957, Vologda Lace Maker, 40k rose, orange and brown, perforation L12 1/2 instead of comb 12x12 1/2, top left corner sheet margin block of four, post office fresh quality item, full OG, NH, VF, Est. $500-$600 (Image)

1957, North Russian Bone Carver, 40k blue, yellow and brown, perforation L12 1/2 instead of comb 12x12 1/2, horizontal pair with neat Moscow cancellation, full OG (NH), VF, a common pair with comb perforation is included, Raritan Stamps guarantee, Est. $600-$750 (Image)

1957, Alexei N. Bach, Russian Biochemist, 40k ultra, brown and buff, perforation L12 1/2 instead of comb 12x12 1/2, unfolded block of four, full OG, NH, VF, Est. $120-$150 (Image)

1957, Youth Festival, 1r multicolored, three stamps - perforated comb 12x12 1/2 with ''Esemirny'' variety at top inscription, perforated L12 1/2 and imperforated varieties, full OG, NH, VF, Est. $150-$200 (Image)

1957, Falling of Sikhote-Alin Meteorite, 40k multicolored, single comb perforation 12x12 1/2 instead of double perforation L12 1/2, unfolded block of four, full OG, NH, VF, Est. $250-$300 (Image)

1957, 40th Anniversary of the October Revolution, 40k x2 and 60k, complete set of three with perforation L12 1/2, common stamps were issued with comb perforation, full OG, NH, VF and guaranteed genuine, Est. $150-$200 (Image)

1957, Maria N. Yermolova, Great Russian Actress, 40k red brown and bright violet, comb perforation 12 1/2x12 instead of L12 1/2, bottom sheet margin block of four, full OG, NH, F/VF centering, Est. $120-$150 (Image)