1890, Jefferson, 30c black, nicely preserved example, full OG, NH and fine stamp, C.v. $850 (Image)

1893, Columbian Exposition issue, 1c-$5, complete set of 15 plate proofs on card, nice margins all around, slight rose ink soiling on reverse of 50c, fresh and nice, no gum as produced, VF, C.v. $2,110 (Image)

1893, Columbians, 2c brown violet, jumbo margins and post office fresh, full OG, NH, VF, C.v. $31 (Image)

1893, Columbians, 2c brown violet, right sheet margin imprint block of four, nicely centered, full OG, NH, VF, C.v. $124++ (Image)

1901, Pan-American Exposition, 1c green and black, 2c carmine and black, two top sheet margin horizontal strips of six, each one has two plate No., arrow and imprint, nice and fresh, full OG, NH, F/VF (at least four stamps are VF),C.v. $570 as two plate strips for each value (Image)

1902-03, definitive issue, 1c-$5, complete set of 14 small die proofs on wove paper, removed from the President Roosevelt presentation album, four proofs with some faults (3c, 13c, $2 and $5), usual paper waves, fresh quality otherwise, no gum as produced, VF appearance of this rare proofs, only 85 complete sets possible, C.v. $4,275 (Image)

1903, Franklin, 1c bluish green, top sheet margin horizontal plate No. strip of five with imprint, perfect condition, full OG, NH, three left stamps with premium centering, VF/XF, C.v. $150++ (Image)

1913, Panama-Pacific Exposition, 5c blue, perforation 12, perfectly centered, full OG, NH, XF, C.v. $150 for very fine centering (Image)

1917, Washington, 5c rose, two error values in center of 12-stamp block, fresh condition, full OG, NH (both errors and five stamps of 2c) or LH/hinged, F/VF, C.v. $1,200 as hinged (Image)

1918, Franklin, $2 orange red and black, top sheet margin horizontal plate No's strip of four with arrow in the middle, perfect quality item, full OG, NH, (two right stamps with excellent centering), F/VF+, C.v. $4,400 as singles (Image)

1918, Franklin, $5 deep green and black, top sheet margin horizontal plate No's strip of four with arrow in the middle, post office fresh, full OG, NH (hinged on margin only), F/VF, C.v. $1,360 as singles (Image)

1920, Washington, 2c carmine, offset printing, type IV, top sheet margin plate No.10896 block of six (3x2), full OG, NH, VF, C.v. $450 (Image)

1938, Presidential issue, ½c-$5, complete set of 32, plate No. blocks of four, post office fresh quality, full OG, NH, mainly VF, C.v. $671 (Image)

1938, Presidential issue, $1 purple and black, block of four imperforated horizontally, nice and post office fresh, full OG, NH, VF, penciled position No.67-68/77-78 are on reverse, C.v. $2,200++ (Image)

1942, American Eagle, 3c reddish purple, error of color, pre-cancelled ''Fremont, Ohio'', fresh condition, F/VF, PSAG certificate, C.v. $1,500 (Image)

1959, San Martin 4c blue, left sheet margin horizontal pair imperforated between stamps, perforation at left shifted to the right as always exists, full OG, NH, VF, only 20 pairs recorded, C.v. $900 (Image)

1969, Professional Baseball, (6c) multicolored, black (engraved) color omitted, full OG, NH, VF, C.v. $500 (Image)

1973, 50-Star and 13-Star Crossed Flags, 10c red and blue, horizontal pair imperforated vertically with blind perforation at top and bottom, full OG, NH, VF, PF certificate for strip of four (that is left pair), C.v. $900 (Image)

1974, Minerals, 10k multicolored, top sheet margin se- tenant block of four with light blue and yellow omitted, full OG, NH, VF, C.v. $900 (Image)

1975, Pioneer 10 Passing Jupiter, 10c multicolored, dark blue (engraved) color omitted, full OG, NH, VF, C.v. $450 (Image)

1975, Bicentennial of US Postal Service, (10c) multicolored, bottom right corner sheet margin ZIP se- tenant block of four with red color (value) omitted, full OG, NH, VF and very rare, according to Datz only 6-8 blocks are known, not priced either in Scott or Datz Cat., a common Airplane stamp is included for comparison (Image)

1979, John Paul Jones issue, imperforated multicolored proof of 15c, horizontal strip of four with vertical gutter in the middle, full OG, NH, VF, C.v. $750++ (Image)

1979, John Paul Jones issue, imperforated multicolored proof of 15c, vertical pair with horizontal gutter in the middle, full OG, NH, VF, C.v. $600 (Image)

1980, Coral Reef, 15c multicolored, se-tenant block of four with blind horizontal perforation, imperforated vertically, full OG, NH, VF and rare, only four blocks recorded by Datz, PF certificate, C.v. $2,750 (Image)

1984, Waterfowl Preservation, Mallards, 20c blue, complete sheet of 50 (5x10) with dramatically misplaced vertical perforation, plate No.19 at the bottom right, full OG, NH, VF (Image)