£1 Red-Brown & Blue, BW #51B, MVLH, Cat $4,500. (Image1)

Estimate AU$1,800

£1 Red-Brown & Blue, BW #51B, regummed, Cat $4,500. (Image1)

Estimate AU$1,000

£1 Red-Brown and Blue with telegraph puncture. (Image1)

Estimate AU$100

£1 Brown & Blue with Melbourne [DE5/13] CTO quarter cancel, 51Awb, no gum, Cat $4,000. Only 108 sets distributed. (Image1)

Estimate AU$1,200

£1 Brown & Blue with Brisbane CTO cancel, BW #51Awc, no gum. (Image1)

Estimate AU$3,000

£1 Brown & Blue marginal block of 4 [L5-6,11-12] with 'Specimen' ovpt, BW #51Axa, catalogued flaws on units L5 & L6, top units MUH, Cat $17,500. A very fine and rare block. Believed to be unique. (Image1)

Estimate AU$12,000

£1 Brown and Blue CA Monogram single, BW #51Az, fresh mint, Cat $90,000. BPA certificate (2012). Only 4 singles recorded in private hands. (Image1)

Estimate AU$50,000

£1 Brown and Blue JBC Monogram single, BW #51Aza, fresh mint, Cat $90,000. Ceremuga certificate (2017). Only two singles recorded. (Image1)

Estimate AU$50,000

£1 Chocolate & Dull Blue, BW #52A, fine mint, Cat $4,000. (Image1)

Estimate AU$1,500

£1 Purple-Brown & Blue, BW #52C, fine mint, Cat $4,000. (Image1)

Estimate AU$1,500

£1 Chestnut and Blue Wmk inverted pair [L39-40], BW #52a, neat cancel, Cat $9,500. Ex Hardy. Pairs are rare. (Image1)

Estimate AU$3,500

£1 Chocolate & Dull Blue perf 'OS', BW #52Ab, two small age marks, fine mint overall, Cat $15,000.PCNZA certificate (2016) (Image1)

Estimate AU$2,000

£1 Brown & Blue with 'SPECIMEN' type B, BW #52x, MLH, Cat $900. (Image1)

Estimate AU$300