6d Blue Die II Watermark inverted BW #19a, rounded corner, good colour, 1917 Port Augusta (SA) datestamp. Cat $275. (Image1)

Estimate AU$20

2½d Indigo marginal block of 6 [2R3-5,9-11] unit 5 nice Flaw on tip of Cape York, hinged in margin only, MUH, Cat $600+. (Image1)

Estimate AU$250

6d Blue Die II variety Watermark inverted BW #19a, well centred, Cat $275. (Image1)

Estimate AU$100

1/- Bright Blue-Green Die IIB Watermark sideways x2, one marginal, BW #33aa, Cat $400. (2) (Image1)

Estimate AU$60

10/- Grey & Deep Aniline Pink BW #48B, Sydney datestamp; also 10/- perf 'OS' CTO; Cat $575. (2) (Image1)

Estimate AU$200

£1 Light Brown & Pale Blue BW #52D, with light CDS double strike, Cat $2,500. (Image1)

Estimate AU$500

£1 Olive-Brown & Pale Blue BW #52E, surface abrasion between 'S' & 'T' of 'AUSTRALIA', well centred, registered datestamp and faint registration crayon line at top, Cat $4,250. (Image1)

Estimate AU$400

£1 Brown & Blue overprinted 'Specimen' Type B BW #52x, some rough perfs, very well centred, lightly mounted, Cat $900. (Image1)

Estimate AU$250

£1 Grey Die IIB BW #53, fine mint, Cat $1,000. (Image1)

Estimate AU$250

£1 Grey Die IIB overprinted 'Specimen' Type C BW #53g,xb, Coloured flaw on top frame over last A of AUSTRALIA, mild even-toned gum, very well centred, lightly mounted, Cat $1,650 as non-Specimen stamp. (Image1)

Estimate AU$180

£2 Purple-Black & Rose Perf 'OS' CTO BW #56wa, centred to lower-left corner, without gum, Cat $4,500. (Image1)

Estimate AU$1,250