1869, Landing of Columbus, 15c brown and blue, G grill, nice margins and beautiful centering, neat cancellation, VF, PF certificate, C.v. $850, Est. $400-$500 (Image)

1893, Columbian Exposition, 1c dark blue and 2c brown violet, perfect quality singles, full OG, NH, VF, C.v. $63.50 (Image)

1893, Columbian Exposition, 5c chocolate, a beautiful single, full OG, NH, VF, PF certificate, C.v. $150 (Image)

1893, Columbian Exposition, 6c purple, excellent condition, full OG, NH, mostly VF, C.v. $150 (Image)

1893, Columbian Exposition, 8c brown purple, strong color and post office fresh appearance, full OG, NH, VF, PSE certificates, C.v. $140 (Image)

1893, Columbian Exposition, 15c dark green, right sheet margin single, full OG, NH, fine and nice stamp, C.v. $600, Est. $200-$300 (Image)

1893, Columbian Exposition, 30c orange brown, nice color and centering, full OG, NH, VF, PF certificate, C.v. $675, Est. $300-$400 (Image)

1893, Columbian Exposition, $1 salmon, sharp color and excellent perforation, full OG, NH and fine single, C.v. $3,400, Est. $1,000-$1,500 (Image)

1893, Columbian Exposition, $4 rose carmine, proof like color and very fresh single, full OG, NH, fine, PF certificate, C.v. $7,000, Est. $2,500-$3,000 (Image)

1894, Bureau issue, 1c-$5, large die proofs on India mounted on sunken die cards, complete set of 13, approximate size 61x64mm, card size 150x200mm, 3k purple with triangle of type II, nice and very fresh unit, VF and scarce, C.v. $4,850, Est. $2,500-$3,000 (Image)

1895, Washington, 2c carmine, type III, top sheet margin plate No.153 horizontal strip of three with imprint, left stamp has tiny toned spot, otherwise nice and fresh, full OG, NH, fine, C.v. $1,400, Est. $350-$400 (Image)

1901, Pan-American Exposition issue, 1c-10c, complete set of six small die proofs on wove paper, approximate size 60x50mm, nice and very fresh unit, no gum as produced, VF and scarce in complete set, C.v. $3,450, Est. $1,500-$2,000 (Image)

1909, Hudson-Fulton Celebration, 2c carmine, horizontal guide pair of vending machine stamps, nicely centered, full OG, LH, VF, C.v. $190 (Image)

1912, Panama-Pacific Exposition, Golden Gate, photo essay of 2c for the design of 5c, size 35x22mm, mounted on card 71x94mm with marking ''Stamp Division. Feb. 21.1912. P.O. Dept.'', fresh and VF, this exact essay is not listed in Scott, the similar essay for 5c is priced $1,500, Est. $600-$800 (Image)

1923, McKinley, large die proof of 7c in black, printed on India paper and mounted on sunken die card, proof size 60x73mm, card size 152x202mm, numbered on reverse with ''332720'', no gum as produced, VF and scarce, C.v. $1,000, Est. $400-$500 (Image)

1923, Grant, 8c olive green, right sheet margin plate No.16450 block of six, full OG, top right stamp is LH, all others - NH, VF, C.v. $575, Est. $200-$240 (Image)

1923, Monroe, 10c orange, top sheet margin plate No. F15277 block of six, full OG, NH, F/VF, C.v. $400, Est. $150-$200 (Image)

1922, Niagara Falls, 25c yellow green, top sheet margin plate No.17445 block of six, both left stamps have slightly disturbed gum, mentioned for accuracy only, full OG, NH, F/VF, C.v. $425, Est. $150-$200 (Image)

1925, Norse-American, 5c dark blue and black, left, top, bottom arrow and central line blocks of four, nicely centered, full OG, NH (2 blocks and 2 lower stamps of bottom arrow blocks) others are hinged, VF, C.v. is about $315, Est. $100-$120 (Image)

1938, definitive issue, Adams, 2c rose carmine, misperforated horizontally left margin vertical pair with horizontal gutter, full OG, NH, VF, Est. $100-$150 (Image)

1938, Presidential issue, Calvin Coolidge, $5 carmine and black, central vignette is strongly shifted to the top right, top plate No. 22167/23475 center line block of four, full OG (uneven on margin as always), NH, F/VF and very scarce, especially on $5 value, Est. $350-$400 (Image)

1940, American Educators, Frances E. Willard, large die proof of 5c in ultramarine, printed on India paper and mounted on sunken die card, proof size 75x90mm, card size 152x203mm, numbered ''622591A'' on reverse and officially signed, slightly rounded corners, still fresh, VF and rare, PF certificate, C.v. $1,500, Est. $600-$800 (Image)

1943, Flag of Czechoslovakia, 5c blue violet, blue, red and black, double impression of ''Czechoslovakia'', full OG, NH, VF, a copy of PF certificate for block of 20, stamp position mentioned, C.v. $600, Est. $200-$300 (Image)

1943, Flag of Austria, 5c blue violet, red and black, double impression of ''Austria'' variety, full OG, NH, VF, C.v. $400++, Est. $200-$240 (Image)

1952, Women in Armed Services, large die proof on wove paper, mounted on die sunk card, proof size 75x57, card size 203x153mm, numbered on reverse with ''92881 B'', officially handstamped and signed, slightly rounded corners, still excellent quality item, VF and very rare, a common stamp is added for comparison, C.v. $1,500, Est. $600-$800 (Image)