ETA SA C120

Cal. C120 is an automatic movement manufactured by ETA SA, built on the Cal. M100 base with a module adding big date and dual timezone functionality. It measures 25.6 mm in diameter and 5.1 mm thick, beats at 28,800 vph, and contains 25 jewels. The big date uses dual discs with windows at 12:00, while the second timezone display sits at 6:00 with a day/night indicator at 8:00. The movement remains in production.