1840 2d Blue (Plates 1, 2)

Block, earliest known use on cover (Gati) [M] 39(4)72

Deliveries, early (Messenger) [M] 33(1)14

First day of use (Jackson) [L] 41(6)126

Mixed frankings, 1840 turned cover with 1d Black and 2d Blue (Pyle) [M] 59(5)107

Plate 2, 'Buccleuch Find' (bottom four rows of sheet) (Jackson) [S] 61(3)72

— 'Buccleuch Find' (bottom four rows of sheet) (SWL90) [N] 28(2)40

— GI, correction to Dendy Marshall reconstruction (Jackson) [S] 49(4)96

— II, correction to Dendy Marshall (Sherman) [N] 27(1)13

— the 'Buccleuch Find', for sale by Spink for £2,750,000 (Jackson) [S] 37(1)13

Production and delivery, Plates 1 & 2 (Messenger) [L] 34(4)61, (Messenger) [S] 34(5)88

Trapezoidal appearance, possible explanation (McCulloch) [L] 55(1)11