1d blue-green group with SG O43 blocks of 9 & 12 (4x3, light bend across the lower row), 1891-96 Thin 'O.S.' Narrow Setting Perf 13 SG O58 block of 6 and No Stop after 'S ' SG O58a in a pair, etc, generally very fine with large-part original gum & many units unmounted, Cat £1340+, for mounted singles.  (35) (Image1)

Estimate AU$750

1891-99 Thin 'O.S.' Narrow Spacing  Perf 13 2d orange SG O59 interpanneau ('gutter') block of 10 (2x5), very well centred, unmounted, Cat £550+, for mounted singles.

Grade A/A+ (Image1)

Estimate AU$250

1891-99 Thin 'O.S.' Narrow Spacing  Perf 13 2d orange SG O59 marginal block of 18 (3x6) from the top of the sheet with Aberrant Overprints in the Margin, very well centred, unmounted, Cat £990+, for mounted singles. Don Pearce's inter-panneau block of 48 (8x6) with Value/Sheet Number sold for $1585. 

Grade A/A+ (Image1)

Estimate AU$500

1891-99 Thin 'O.S.' Narrow Spacing  Perf 10 6d blue with No Stop after 'S ' SG O62a, lightly cancelled, Cat £500. Don Pearce's example sold for $365. 

Grade A (Image1)

Estimate AU$300

1891-99 Thin 'O.S.' Narrow Spacing  Perf 11½-12½ 'Bantam' ½d red-brown SG O64 horizontal strip of 8, GPO cds apparently without date-slugs, Cat £120+. The equal-largest recorded used multiple.  

Grade A (Image1)

Estimate AU$150

1891-99 Thin 'O.S.' Narrow Spacing  Perf 15 4d lilac with the Overprint Double/Triple SG O66a horizontal pair, well centred, large-part original gum with a hinge remainder, Cat £1200+, for mounted singles. Don Pearce's very fine pair sold for $1280. RPSofV Certificate (2010). 

Grade A- B1 (Image1)

Estimate AU$800

1891-99 Thin 'O.S.' Narrow Spacing  Perf 15 4d lilac with the Overprint Double/Triple SG O66a, 7mm concealed tear at right, GPO duplex cancel, Cat £750. Gary Diffen's example - stated to be "the only used example known to the vendor" - sold for £300. Don Pearce's very fine example sold for $760.

Grade (A) (Image1)

Estimate AU$250

1891-99 Thin 'O.S.' Narrow Spacing  Perf 15 4d lilac as SG O66 but with No Stop after 'S', light GPO duplex cancel. Unlisted in Gibbons, absent from Gary Diffen's and Don Pearce's collections, and the only example known to us.

Grade A (Image1)

Estimate AU$250

1891-99 Thin 'O.S.' Narrow Spacing  '2½d.' in Brown on Perf 10 4d blue-green SG O71 block of 12 [Pos 19-24/25-30], mostly well centred, GPO cds of AU18/94, Cat £420+, for singles. Stated to be the largest recorded multiple. 

Grade A (Image1)

Estimate AU$400