With over 21 billion printed between 1841 to 1879, most Penny Red stamps are commonly found and of little value. The price of a Penny Red can be affected by its condition, marginal inscription, plate number, color and year.
The most valuable Penny Red stamp is one printed from the 77 plate due to the technical errors contained in the plate. In 2012, a 77 Penny Red stamp sold at auction for over $900,000. Only one sheet of the stamp was produced using the 77 plate. Stamps printed after 1864 that contain a plate number may also be worth more than the majority of Penny Reds.