Changing a Battery

Replacing the back case cover. Before replacing the back case cover make sure that the watch is working, if the watch has a rubber seal between the case and the back case cover inspect it for wear & tear if damaged replace it, examine the back case cover for a indent that allows the winder shaft to pass through, make sure that it is aligned, Place a piece of material on a firm surface such as a table then place the watch face down then place the rubber seal onto the watch case or the back case cover place the back case cover on the watch case making sure that they are aligned then with both thumbs press down on the back case cover pushing it into the watch case, be aware not to break the glass on the watch face.