1955, Nicolaus Copernicus, 1r multicolored, unfolded miniature sheet of ten, intact margins and post office fresh, full OG, NH, VF and very rare (Image)

1955, Moscow University, 1r multicolored, perforation L12 1/2 instead of comb 12 1/2x12, unfolded block of four, top right stamp has broken a curl of ''P'' in ''Pochta'' variety, full OG, NH, VF and extremely rare multiple, only a few of blocks of this rarity still survived (Image)

1956, Academician Alexey Krylov, 40k gray, brown and black, perforation L12 1/2 instead of comb 12 1/2x12, top left corner sheet margin block of four, unused, expertly regummed, VF appearance of this very rare perforation variety especially in positional multiple. We are of the opinion that original gum was removed because of its heterogeneity; microscopic examination showed no evidences of CTO on that block (Image)

1956, Academician Alexey Krylov, 40k gray, brown and black, perforation L12 1/2 instead of comb 12x12 1/2, top left corner sheet margin block of four, CTO with full OG, VF (Image)

1956, Mukhamed Aivazov, 40k green, type I (three-line text), top left corner sheet margin unfolded block of four, full OG, NH, VF (Image)

1956, Mukhamed Aivazov, 40k green, type I (three-line text), perforation L12 1/2 instead of comb 12x12 1/2, full OG, NH, VF and rare, Raritan Stamps guarantee (Image)

1957, Robert Burns, 40k light ultra and brown, block of four, lower left stamp imperforated on the left and at the bottom due to break of line perforation, central CTO, full OG, VF and a spectacular piece (Image)

1956, Antarctic Expedition, 40k multicolored, unfolded block of four, top right stamp without flag on the aft, full OG, NH, VF (Image)

1956, Generalissimo Alexander Suvorov, technological proof of complete design for 1r in olive green and red brown, imperforated block of four, printed on wove paper without watermark, no gum as produced, NH, VF and extremely rare in block, Raritan Stamps guarantee (Image)

1956, Generalissimo Alexander Suvorov, technological proof of central vignette in red brown used for 1r denomination, imperforated block of four, printed on wove paper without watermark, no gum as produced, NH, VF and very rare multiple, V. Liapine certificate (Image)

1956, 30th Anniversary of the Shatura Power Station, 40k multicolored, brown color is printed twice, nicely centered and post office fresh, full OG, NH, VF (Image)