ETA SA 255.481

Caliber 255.481 is a round quartz movement manufactured by ETA SA in Switzerland. It measures 23.3 mm in diameter and 2.7 mm in height. The movement uses a stepping motor operating at 16 steps per second at 1.55V, increasing to 32 steps per second when battery voltage drops below 1.40V, and features an end-of-life indicator that advances the hands in four-step jumps every four seconds. Current consumption is ≤1.50 μA. The caliber displays date, day, month, and moon phase, with quickset day correction. Power reserve is approximately 20-21 hours from a 1.55V battery. The stop lever engages when the crown is in position 3.