Chronology
- February 1841 - colour of 1d stamp changed from black to red.
- 1854 - perforations introduced.
- January 1855 - perforation size changed from 16 to 14.
- 15 May 1855 - watermark changed from small crown to large crown.
- 1 April 1864 - letters on all four corners and plate number engraved on each stamp from plate 72 onwards.
- 27 October 1879 - last plate (225) put to press.
- 3 December 1879 - contract to print the Penny Red formally ended.
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