Coins, Tokens and Historical Medals

Proving Pieces, Royal Mint (in conjunction with Texas Instruments), trials (10), in nickel (6), white metal, aluminium, brass and bronze, revs. Texas Instruments logo above numeral (1, 3, 4, 5 [2, nickel and aluminium], 6, 7 [white metal], 9 [bronze], un-numbered [2, nickel and brass]), all 23mm (cf. DNW 67, 477) [11]. As struck, a scarce group
£200-£260

Texas Instruments, Dallas, founded 1930. These trials are believed to have been struck in the late 1970s and early 1980s; the numbers on the reverses are said to denote different plating types