Swatch Sistem51 SUTS401 SISTEM BLUE Date Black Dial Swiss Automatic 42mm Watch. Swiss automatic, exhibition back, completely sealed.
White sweeping seconds hand, date window, semi-translucent case, thread stitched silicon strap. Cleaned, tested, no scratches on crystal. 42mm (50.6mm lug to lug) X 13.9mm thick X 20mm strap.
Automatic movement Swatch/ETA Sitem51: 51 components, 1 central screw, up to 90 hours power reserve. Can be hand wound by turning the crown opposite direction than you would normally wind a watch.
Three - 60 Second, 30 Minute and 1/10th of a Second. 51 parts, 5 modules, 19 Jewels.