ETA SA VALJOUX-A05-H31

The VALJOUX-A05.H31 is an automatic chronograph movement manufactured by ETA SA in Switzerland. Based on the ETA 7753 platform from the Valjoux 77XX family, it operates at 28,800 vph (4 Hz) with a 60-hour power reserve. The movement features Nivachoc shock protection and a ball-bearing rotor, driving a 30-minute and 12-hour chronograph counter. It is exclusive to Swatch Group brands, notably powering the Tissot PRX Automatic Chronograph.