The Ronda 1317-21 watch movement, introduced in 1908, is an open face calibre movement with the option for late samples to have a separate escape-wheel cock. It includes a timer function with a measurement accuracy of 60 seconds (0.2 seconds) and a range of 30 minutes, operated by a pillar wheel mechanism. Alternatively, there is an option for a 30-second (0.1 second) timer with a range of 15 minutes. The movement is stem wind, features a sweep second hand, and includes a sub minute display. The Ronda 1317-21 movement was used starting from 1908.