1924, definitive issue, soldier 40k slate, litho printing, right sheet margin imperforated single with design printed on both sides (on gum - upside down), in addition the similar horizontal imperforated pair (cut through design at bottom) with invalidating perforation, all with full OG, NH, VF, a single with Raritan Stamps guarantee, Est. $1,500-$2,000 (Image)

1924, Lenin Mourning issue, 3k-20k, imperforated complete set of four, narrow frame, perfect quality unit, full OG, NH, VF, Est. $1,200-$1,500 (Image)

1924 (February 7), Lenin Mourning issue, 20k red and black with narrow frame, top right corner sheet margin vertical pair used on reverse of registered cover from Kharkov to London, addressed to British Federation of Ukrainian Jews, red London arrival ''15.FE.24'' ds, F/VF and scarce franking, Est. $150-$200 (Image)

1924, Lenin Mourning issue, 6k red and black, perforated single (medium frame) with a break in black frame under the portrait, large part of OG, VF, Est. $75-$100 (Image)

1924-25, definitive issue, peasant 2k green, typo printing, imperforated bottom right corner sheet margin block of 22 (2x8 and 6 at top) complete and part of stamps, 12 of which have double impression, control text at bottom selvage, horizontal invalidating perforation across the design, NH, VF and a spectacular item, Est. $1,200-$1,500 (Image)

1924, definitive issue, peasant, perforate (14½x15) and imperforate proofs of 6k in gray, printed on paper without watermark, the last one with sheet margin at left, full OG, NH, VF, Est. $150-$200 (Image)

1925, Lenin Mausoleum, 7k-40k, imperforated complete set of four used on registered cover from the 1st All-Union Philatelic Exhibition in Moscow, addressed to Saratov, tied by special Exhibition date stamp, arrival ds is on reverse, mostly VF, Est. $150-$200 (Image)

1925, Lenin Mausoleum, imperforated plate proof of 7k in deep blue, printed on Goznak security paper, ironed crease and paper scratch on reverse, no gum as issued, F/VF appearance, Est. $100-$150 (Image)

1925, definitive issue, Lenin 5r brown red and 10r indigo, imperforate complete set of two in bottom left corner sheet margin blocks of four, full OG, NH, VF, C.v. $300 as hinged singles (Image)

1926, definitive issue, worker 8k brown olive, litho printing, ''small head'' variety, perfectly centered, full OG, trace of hinge, VF and very scarce, Raritan Stamps guarantee, Est. $2,500-$3,000 (Image)

1925, Decembrist Revolt of 1825 and Revolution of 1905, two imperforate complete sets of three on illustrated Moscow postcards (Kazan Train Station and the Assumption Cathedral in Moscow Kremlin), both sent by registered mail to France on March 5, 1927, mostly VF, Est. $150-$200 (Image)

1927, 10th Anniversary of the October Revolution, 3k bright rose, top sheet margin single imperforated at the top, full OG, very light trace of hinge on margin, VF, Est. $500-$600 (Image)

1929, Iron Furnace, 20k green, perforation L10¾ instead of comb 12¼x12, nice state of preservation, full OG, NH, fine centering of this rare stamp, N. Mandrovski certificate, C.v. $10,000, Est. $4,000-$5,000 (Image)

1933, Ethnographic issue, Tajiks, perforated (L11½) trial color proof of 15k in brown on watermarked Borders and Rosettes paper, size 47x22mm instead of 48.5x22.5mm for issued stamp, a part of ''P'' red overprint ''Proekt'', two translucent tips of perforation, fresh quality single removed from a presentation card and later gummed, F/VF and scarce, a common stamp is included, Raritan Stamps opinion, Est. $600-$800 (Image)

1933, Baku Commissars, trial color perforated proof of 5k in brownish gray, printed on paper with watermark Borders and Rosettes, perforation L13¾, gummed, VF, Est. $750-$1,000 (Image)

1933, Baku Commissars, 20k purple, bottom sheet margin single imperforated at foot, full original uneven gum as always exists, NH, VF, Est. $700-$800 (Image)

1933, Baku Commissars, trial color perforated proof of 40k in brown, printed on paper with watermark Borders and Rosettes, perforated vertically L13¾ and imperforated at top and bottom, black crayon cancellation, full OG, previously hinged, VF, Est. $600-$800 (Image)

1936, Pioneers Helping Post, 1k-15k, complete set of six (mixed perforation) used together with two other values on registered cover from Moscow to Stockholm, Moskva-25 ''9.12.36'' cancellation, no arrival marking as often, mostly VF, Est. $150-$200 (Image)

1937, 100th Anniversary of the Death of Alexander Pushkin, souvenir sheet of 10k and 50k, 5 examples, one of which with a dot inside ''Pochta'' variety, full OG, NH, VF, C.v. $250++, Est. $100-$150 (Image)

1937, Architectural Congress, 40k violet, souvenir sheet of four values, 5 examples, full OG, NH, VF, C.v. $275, Est. $75-$100 (Image)

1937, definitive issue, farm worked 4k claret, printed on paper without watermark, top sheet margin unfolded block of four, full original gum with usual waves, NH, VF, C.v. $500++, Est. $150-$200 (Image)

1936, definitive issue, factory worker 10k blue black, perforation L12½ instead of comb 12x12½, full OG, NH, VF, Est. $75-$100 (Image)

1939, definitive issue, factory worker 30k claret, horizontal imperforate pair, balanced margins, full OG, NH or very light trace of hinge on left stamp, VF, C.v. $1,550, Est. $700-$800 (Image)

1938, definitive issue, Lenin 40k dark blue, enlarged margin imperforate single, large part of OG, VF, C.v. $375, Est. $150-$200 (Image)

1938, Second Trans-Atlantic Flight, 10k claret, balanced margins imperforate single, full OG, VLH, VF and scarce, expertized by Z. Mikulski , C.v. $825, Est. $500-$600 (Image)