ST1902 Movement Manual Winding Mechanical Chronograph Movement Clock Movement Men’s Watches Man Watch Repair Parts. Product Type: ST1902 Movement Movement Calibre: about 31.3 mm Movement height: about 6.25 mm Beats Per Hour: 21600 Crown Position : Crown at 3 o’clock Function: 6 hands movement, middle hour, minute and second hand, 3 o’clock dial chronograph minute hand, 6 o’clock dial hour hand, 9 o’clock dial small second hand. Movement parts are precision parts, easy to damage, Need to be replaced by professionals. If you don’t know how to replace, you can find a professional watchmaker to replace. The item is lost during transit, b. The item is damaged during transporting, c. The item in the actual use of the process of quality problems.