KNIGHTON - PAIR OF 1d BLACK PLATE 3 COVERS - 9 Jan./9 Mar. 1841 large part E/EL both to Ludlow franked with four margin 1d blacks, IA or GD, cancelled and each with the tiniest of ties in red or black. Both with small KNIGHTON udc on the top flap. (2)Cross Reference: 1840 1d BLACKS (Image)