Plate Numbers
On 1 April 1864, the stamp was issued with the plate number engraved in the design, in the left and right side lace work. At this time, the stars in the top corners were also replaced with the same check letters as used in the lower corners, but in reverse order.
Because of wear, over 400 different plates were used to print the Penny Red. Two different basic watermarks were used for the paper, small crown, (on the early issues) and large crown, introduced on 15 May 1855. The first stamps printed on the large crown watermarked paper showed two small vertical lines in the central portion of the crown. Later printings showed a revised watermark on which these central lines are not present.
Read more about this topic: Penny Red
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