The computer was announced in May 1960. The first customer delivery was in 1962, a 1301 sold to the University of London. About 150 to 200 of these machines were sold. One of their main attractions was that they performed British currency calculations (pounds, shillings and pence) in hardware. They also had the advantage of programmers not having to learn binary or octal arithmetic as the instruction set was pure decimal and the arithmetic unit had no binary mode, only decimal or pounds, shillings and pence. The London University machine was restored to working condition by a group of enthusiasts completing their task in 2012.