The Ball DM3090A-P10J-BE mechanism winds itself thanks to the movement of the wrist. For the device to work efficiently and accurately determine time, it should be used regularly. There are as many as 25 stones in the most important points of the high-quality mechanism. The operating time of a mechanical watch from winding it until the watch mechanism stops completely is 38 hours. By default, the warranty for this model is valid for 4 years, but you can - if you want - extend it for another year.