1858, 10k brown and blue, perforation 14 1/2x15 (slightly defected), numeral watermark ''1'', used on entre letter from St. Petersburg to Narva, tied by experimental dotted ''1'' cancellation (with extra two pairs dots in front and behind of ''1''), pre-philatelic two-line St. Petersburg red ''22.FEB.1858'' date stamp is alongside, F/VF, Est. $200- $250 (Image)

1866-70, 1k-20k, complete set of six, perforation 14 1/2x15, printed on horizontally laid paper, three stamps with margins, full OG, NH, VF, Est. $200-$250 (Image)

1869, 3k black and green, 5k black and lilac, both with perforation 14 1/2x15 on paper without watermark, 20k blue and orange on horizontally laid paper, used on entire letter from St. Petersburg to Montpellier, tied by dotted oval ''S.P.B.'' marking along with normal date stamp, arrival ds on reverse, F/VF, Est. $150-$200 (Image)

1875-79, 7k, 8k, 10k and 20k, set of four values in top left sheet margin (full or partial) blocks of four on horizontally laid paper, full OG, NH, VF, Est. $1,000-$1,200 (Image)

1883, 2k dark bluish green, imperforated single with balanced margins on horizontally laid paper, background is slightly shifted to the left, bold color and strong impression clearly visible on reverse, redistributed part of original gum, VF and rare variety, C.v. $1,100, Est. $500-$600 (Image)

1889-92, 1k orange, right sheet margin imperforated block of four with large red ''Obrazets'' initials, printed on horizontally laid paper, slight mostly marginal folds and minor full original gum soiling, NH, VF and rare, especially in multiple, Est. $500-$600 (Image)

1889-92, 3.50r black and gray, 7r black and yellow, set of two high values on horizontally laid paper, full OG, previously hinged, VF, C.v. $240, Est. $150-$200 (Image)

1889-92, 7r black and yellow, bottom sheet margin single printed on horizontally laid paper, the ''key'' stamp from the set, full OG, barest trace of hinge, VF, C.v. $190, Est. $100-$140 (Image)

1902, rectangular imperforated essay of 7k in dark rose, unissued design with Coat of Arms in the middle, printed on thin card, perfect quality, no gum as issued, VF and rare, Standard Cat. #UD43 var, Est. $1,500-$2,000 (Image)

1912-17, 15k red brown and blue, printed on paper with vertical varnish lines, inverted offset of the design on the face, appearing as double impression, full OG, very light trace of hinge, VF and a spectacular item, P. Buchsbayew certificate, Est. $140-$180 (Image)

1915, Romanov Dynasty money stamps, Nicholas I, 15k orange brown, bottom sheet margin imperforated single, text on reverse is misplaced, no gum as issued, NH, VF, C.v. $200, Est. $120-$150 (Image)

1915, Romanov Dynasty money stamps, Alexander I, 20k olive green with double impression, bottom right corner sheet margin imperforated block of eight, no gum as produced, NH, VF, Est. $500-$600 (Image)

1917, 10r carmine, yellow and gray, bottom sheet margin imperforated block of four, top right stamp with open outer oval at bottom (position 42), full OG, NH, VF, Est. $500- $600 (Image)

1917-19, last issues of Imperial stamps, seven perforated and four imperforated with spectacular offsets on reverse, full OG, NH or LH/hinged, F/VF, Est. $130-$150 (Image)

1913, Peter the Great, imperforated large die proof of 1k in black, printed on chalk-surfaced thick paper, size 47x45mm, traces of hinge at top, no hidden defects, VF, proofs in black are extremely rare, only a handful was produced, Est. $1,200-$1,400 (Image)

1913, Peter the Great, imperforated large die proof of 1k in carmine rose, printed on chalk- surfaced thick paper, size 46x50mm, no thins or other hidden defects, VF and rare, Est. $1,000-$1,200 (Image)

1913, Peter the Great, imperforated large die proof of 1k in orange, printed on chalk-surfaced thick paper, size 47x57mm, traces of previous mounting, no thins or other defects, VF and rare, Est. $1,000-$1,200 (Image)

1913, Alexander II, imperforated large die proof of 2k in black, printed on chalk-surfaced thick paper, size 41x50mm, traces of hinges at top, no usual thins, VF and very rare, Est. $1,200-$1,400 (Image)

1913, Alexander II, imperforated large die proof of 2k in carmine rose, printed on chalk-surfaced thick paper, size 47x48mm, traces of hinges as usual, no hidden defects, VF and rare, Est. $1,000-$1,200 (Image)

1913, Alexander II, imperforated large die proof of 2k in brownish orange, printed on chalk- surfaced thick paper, size 43x51mm, usual hinge traces, no hidden defects, VF and rare, Est. $1,000-$1,200 (Image)

1913, Alexander III, imperforated large die proof of 3k in black, printed on chalk-surfaced thin cardboard, size 34x44mm, shallow paper scratch on reverse with no importance, VF and very rare, Est. $1,000 -$1,200 (Image)

1913, Alexander III, imperforated large die proof of 3k in green, quadruple (three inverted) impression on chalk-surfaced thick paper, size 48x57mm, traces of hinge at top, no usual thins or other hidden defects, VF and probably unique, Est. $1,500-$2,000 (Image)

1913, Alexander III, imperforated large die proof of 3k in carmine rose, printed on chalk-surfaced thick paper, size 39x53mm, trace of hinge at top as usual, no thins or other defects, VF and rare, Est. $1,000-$1,200 (Image)

1913, Alexander III, imperforated large die proof of 3k in yellow orange, printed on chalk- surfaced thick paper, size 45x49mm, no thins or other hidden defects, VF and rare, Est. $1,000-$1,200 (Image)

1913, Peter the Great, imperforated large die proof of 4k in black, printed on chalk-surfaced thin cardboard, size 45x60mm, VF and very rare, proofs in black were printed in very small quantity, Est. $1,200- $1,400 (Image)