Penny Black print run was 286,700 sheets, containing a total of 68,808,000 stamps. Many were saved, and in used condition they remain readily available to stamp collectors. The only known complete sheets of the Penny Black are owned by the British Postal Museum. In addition to the general issue of the Penny Black, a similar stamp intended for official mail was produced, with the letters "V" and "R" replacing the crosses in the top corners. Because the general public quickly accepted the postage stamps and ridiculed the Mulready stationery produced at the same time, vast supplies of Mulready letter sheets were given
Penny Red issued until 1971 when decimal currency was introduced when the sheet size was changed to 200, (20 rows of 10 stamps) making the lowest value denomination (half penny) one pound per sheet. 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