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 & Giles Penny & Giles Penny & Giles (P&G) was a British engineering company in Dorset (former Hampshire) that made flight recorders (black boxes). The company was founded in 1956 by Prof William Alfred Penny and James Giles. It made high-reliability wire-wound potentiometers for aircraft in flight testing. In 1957 it made the first aircraft data recorder with magnetic recording on a stainless steel wire, known as a "black box". In 1963, the Ministry of Aviation informed the UK aircraft industry that all civil airliners would have to have flight data recorders. In April 1973, Penny and Giles Conductive Plastics received a