1857, 1¢ blue, type V, plate proof on India paper. Horizontal pair from plate 9, margins to touching or barely in, crisp impression and rich color, Fine.
Scott No. 24P3; $3,000. US$0 (Image)

Scott $3,000

1857, 3¢ red, type II, plate proof on India paper. On card. Plate 20 single, well margined to close at bottom right, Very Fine, with 2006 P.F. certificate.
Scott No. 26P3; $1,250. US$0 (Image)

Scott $1,250

1857, 3¢ red, type II, plate proof on India paper. Plate 20 horizontal pair, well margined, right proof with small corner fault, only three or four pairs recorded, extremely scarce, Very Fine appearance.
Scott No. 26P3; $3,000. US$0 (Image)

Scott $3,000

1859, 10¢ green, type V, plate proof on India paper. Crisp impression and choice deep color, mostly well margined but just touching bottom scrolls, still near Very Fine.
Scott No. 35P3; $1,250. US$0 (Image)

Scott $1,250

1857, 12¢ black, plate III, proof on stamp paper. Large margins; faint horizontal crease at bottom, Very Fine appearance, with 2002 P.F. certificate.
Scott No. 36BP5; Estimate $300 - 400. US$300-400 (Image)

Est. $300-400

1860, 24¢ red brown, trial color plate proof on wove paper. Exceptionally fresh with deep rich color, margins to clear at top, Fine.
Scott No. 37TC5b; $600. US$0 (Image)

Scott $600

1860, 24¢ deep yellow, trial color plate proof on wove paper. Exceptionally fresh and bright with margins to just touching at top, Fine.
Scott No. 37TC5d; $600. US$0 (Image)

Scott $600

1860, 24¢ lilac, large die proof on India paper on card. 30.5x37 mm; somewhat toned, otherwise Very Fine. Unpriced by Scott and exceedingly rare., with 1991 P.F. certificate as "lightly stained".
Scott No. 37P1; Estimate $1,000 - 1,500. US$1,000-1,500 (Image)

Est. $1,000-1,500

1860, 24¢ lilac, plate proof on India paper. Right side part imprint single, margins to slightly in at bottom, extremely fresh, scarce position piece, Fine, with 1999 P.F. certificate.
Scott No. 37P3; $1,250. US$0 (Image)

Scott $1,250

1860, 24¢ lilac, plate proof on India paper. Horizontal pair, ample to large margins, crisp impression and rich color, Very Fine, with 1999 P.F. certificate.
Scott No. 37P3; $3,000. US$0 (Image)

Scott $3,000

1860, 24¢-90¢, imperf proofs on stamp paper. Without gum as issued, 24¢ with large margins all around, others large to touched at top, a Very Fine and rare set, 24¢ with 1960 P.F., 30¢ with 1945 A.P.S. and 1965 P.F., and 90¢ with 1987 P.F. certificate.
Scott No. 37P5-39P5; $7,500. US$0 (Image)

Scott $7,500

1860, 30¢ black, trial color plate proof on wove paper. Positions 50R-60R-70R, right selvage singles showing part of imprint and plate number, each with large margins to clear, detailed impressions, Extremely Fine and unique imprint assemblage.
Scott No. 38TC5a; $3,000+. US$0 (Image)

Scott $3,000+

1860, 30¢ black, trial color plate proof on wove paper. Large margins all around, canceled by bold Trial Postmark in Black ink, Very Fine and rare.
Scott No. 38TC5a; Estimate $1,000 - 1,500.

There is a Bureau Specialist article with letter by Postmaster General Zevely objecting to this color because of the difficulty in canceling it; the writer speculates this arose from experiments carried out by the P.O. rather than past experience with the 12c stamp since the Department "kept the black color for the 12c value for nine years and did not mention their objections when Toppan, Carpenter & Co. first recommended black". US$1,000-1,500 (Image)

Est. $1,000-1,500

1860, 30¢ black, trial color plate proof on wove paper. Large margins to barely touched, detailed impression, Very Fine and scarce, ex-Dupuy.
Scott No. 38TC5a; $1,000. US$0 (Image)

Scott $1,000

1860, 30¢ black, trial color plate proof on wove paper. Position 21R, large margins to clear at top right, guideline shows at left edge, detailed impression showing double transfer variety, Very Fine and scarce.
Scott No. 38TC5a; $1,000. US$0 (Image)

Scott $1,000

1860, 30¢ orange, small die proof on wove paper. A choice and extremely fresh proof, Very Fine, listed but unpriced by Scott.
Scott No. 38P2; Estimate $250 - 350. US$250-350 (Image)

Est. $250-350