Swiss made, automatic (bi-directional winding), 30.3 mm/5 mm, 27-jewels, 70-hour power reserve, 4Hz (28,800 vph). Traversing balance bridge, free-sprung Microstella balance wheel, silicon balance spring. Industrial finish including sandblasting, satin brushing, and polishing. COSC-certified Swiss chronometer.
Tudor adjusts the movement to -2/+4 after being cased up, which exceeds standard chronometer tests that require the movement to be adjusted to -4/+6 prior to being cased up.