The ETA 1315 watch movement is a result of a joint development in the period from 1969, involving Hamilton-Buren, Breitling, and Heuer. The movement features a Dubois-Depraz 8510 module on a modified Buren 1281, with a crown positioned at 9 o'clock. It incorporates a micro rotor and a double excenter regulator for curb pins and stud carrier, enabling a low-profile design. The ETA 1315 movement offers a range of functions including an automatic chronograph with 60-second, 30-minute, and 12-hour capabilities, cam switched. It also includes a 24-hour GMT, date-setting accomplished by changing the 21-24 hour, and automatic functionality.