The ETA 1310 watch movement, utilized during the period of 1960-1963, is built upon the Felsa 4007 base, incorporating a heavier rotor borrowed from the Felsa 4002. However, the balance assembly and barrel are sourced from MST. This movement offers automatic winding capabilities, a sweep second function, and a date display that can be adjusted by changing the time to a specific range of hours (21-24h).