£1 Brown & Blue variety Misplaced Kangaroo 1mm downwards into Bight, fresh mint, Cat $4,500 (as normal). (Image1)

Estimate AU$1,800

£1 Brown & Blue variety Misplaced Kangaroo 1½mm downwards into Bight, used, Cat $3,500 (as normal). (Image1)

Estimate AU$800

£1 Brown & Blue telegraph punctured marginal block of 4 [L52-53,58-59] unit 52 with Kangaroo's foot broken and pointed tail (#51(V)n), fine used. Blocks with telegraph punctures are very scarce, particularly with a catalogued variety. (Image1)

Estimate AU$800

£1 Brown & Blue perf large 'OS', BW #51b (SG #O14, cat £11,000+), MUH, Cat $15,000 (as mint). RPSL certificate (2006). A great rarity. One of the finest examples in existence. (Image1)

Estimate AU$9,000

£1 Brown & Blue bottom left corner single handstamped 'Specimen', BW #51x, some perfs re-inforced, Cat $950. (Image1)

Estimate AU$300

£1 Brown & Blue marginal block of 4 [L1-2,7-8] unit 1 with Specimen ovpt doubled, one inverted, BW #51xb, MNG, Cat $20,000. Ex Gray. A handsome and unique block. (Image1)

Estimate AU$18,000

£1 Brown and Blue CA Monogram single, BW #51z, fresh mint, Cat $90,000. Ex McNess, Perry & Keeche. Only four singles recorded. (Image1)

Estimate AU$50,000

£1 Brown and Blue JBC Monogram strip of 3 (no left margin) with 'Specimen' handstamps, BW #51x,za, central unit hinged. The unique strip. (Image1)

Estimate AU$20,000

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

Estimate AU$50,000

£1 Chestnut & Blue with Wmk inverted, BW #52a (SG #44aw, cat £4,500), fresh MVLH, Cat $6,000. (Image1)

Estimate AU$2,500

£1 Chocolate & Dull Blue Perf 'OS' marginal single with Broken tail on kangaroo [L12] also the kangaroo is misplaced to the left with the ear just outside the map, BW #52b(V)e (SG #O52, cat £11,000+), fresh MUH, Cat $25,000+ for normal stamp perf 'OS'. Ceremuga certificate (2006). (Image1)

Estimate AU$10,000

£1 Chocolate & Dull Blue CA Monogram strip of 3, BW #52z, fresh MVLH, Cat $200,000. Ex McNess, Perry & Keeche. An exceptional item. The only strip of 3 of any of the pound values in private hands. (Image1)

Estimate AU$100,000

£1 Chocolate & Dull Blue JBC Monogram single, BW #52zb, fresh MVLH, Cat $100,000. The only example in private hands with an upright wmk. (Image1)

Estimate AU$50,000

£1 Chestnut & Blue JBC Monogram single with Wmk inverted, BW #52a,zb, fresh MVLH, Cat $125,000. Ex Gray & Sterling. The only example in private hands with inverted wmk. (Image1)

Estimate AU$50,000

£1 Chocolate & Milky Blue Harrison Imprint single. The rarest of all imprints, with only one block of 4 (cat $325,000) and this single in private hands. (Image1)

Estimate AU$50,000

£1 Chocolate & Milky Blue block of 4 [R41-42,47-48], catalogue varieties on unit 41 Broken coast in Bight and unit 48 Break in value circle at lower left, distinct uncatalogued variety on units 47 Damaged left ear, BW #52(D)r,s, some marks on back, fresh postal use, Cat $12,000++. Thought to be the largest commercially used multiple in existance. An amazing block only ever sold once, in 2004, prior to that it had been in a family collection for three generations. (Image1)

Estimate AU$20,000