ETA SA A01

The A01 is an automatic caliber manufactured by ETA SA, featuring a micro-rotor winding system and operating at 28,800 vph with a 48-hour power reserve. It contains 32 jewels with Incabloc shock protection and displays hours, minutes, and seconds in counter-clockwise direction via a retrograde complication. The movement bridges are skeletonized, and the caliber is exclusive to ALTO, found in the ART 01 limited edition.