6d Consort Trial Colour Plate Proof in Black, with Vertical SPECIMEN Overprint in Carmine, a left sheet margin block of four on card-mounted India paper, showing parts of two stamps at bottom. There are clear horizontal guidelines in the sheet margin at left, going through all the stamps, very fine. Rsv. $450. (Image)

Unitrade $ 1,400

1851 6d Slate Violet Consort Imperforate on Laid Paper, unused (no gum), with three large margins (showing part of next stamp at top), bottom is clear, with a tiny tear in the upper left margin (just touching outer frameline), else fine. Very few unused examples exist. Accompanied by a 1993 Greene Foundation certificate. Rsv. $7,500. (Image)

Unitrade $ 30,000

1852 3d Orange Red Beaver Imperforate on Thin Crisp Paper, with Major Re-Entry, used with a well-centered and crisp strike of the 4-ring #8 (Chatham, CW), with three large margins, just touching outer frameline at top, fine. The stamp has a clearly visible major re-entry from position 47, showing strong doubling in both lower 3s and the words THREE PENCE, etc. A great combination of attributes for the specialist. (Image)

Unitrade $ 650

1855 6d Greenish Grey Consort Imperforate, unused (no gum), with four margins, clear at top, fresh and fine. A rare stamp in this lovely unused condition. Accompanied by a 1997 Greene Foundation certificate. Rsv. $6,400. (Image)

Unitrade $ 15,000

10d Cartier Trial Colour Plate Proof in Black with Vertical SPECIMEN Overprint, on card-mounted India paper, very fine and rarely offered. (Image)

Unitrade $ 1,000

1855 10d Blue Cartier Imperforate on Thick White Paper, unused (no gum), with four clear to large margins, a fresh and fine-very fine stamp. Accompanied by a 2003 Greene Foundation certificate. Rsv. $5,600. (Image)

Unitrade $ 10,500

½d Queen Victoria Plate Proof in Rose, with vertical SPECIMEN Overprint in Green Black, a block of four on card-mounted India paper, very fine. Rsv. $350. (Image)

Unitrade $ 1,200

½d Queen Victoria Plate Proof in Rose, with Vertical SPECIMEN in Green Black, a vertical block of six, on India paper with pencil numbers on back, possibly indicating plate positions (7-8, 19-20, 31-32), very fine. Rsv. $475. (Image)

Unitrade $ 1,800

1857 ½d Rose Queen Victoria with Re-Entry from Position 84, mint with full original gum and four large margins, the stamp shows a re-entry in the letters "CAN", from position 84 of the sheet of 120 (Trimble re-entry #8), very fine. Catalogue value given is for a regular stamp only. Accompanied by a 2019 Greene Foundation certificate. Rsv. $1,800. (Image)

Unitrade $ 2,800

7½d Queen Victoria Plate Proof in Blue Green, a block of four on India paper, showing a tiny portion of the imprint at upper left, very fine. Rsv. $550. (Image)

Unitrade $ 1,400

1857 7½d Green Queen Victoria Imperforate, mint with full original gum, lightly hinged. A lovely stamp possessing fresh colour and a crisp impression, with four large to well clear margins, very fine. Accompanied by 1968 Philatelic Foundation (issued to Julian Smith) and 2016 Greene Foundation certificates. Rsv. $13,000. (Image)

Unitrade $ 24,000