specifications:<br>Case/Chain material:Alloy<br>Case diameter:48mm<br>Chain Length:38mm (Hook included)<br>Case Thinkness:12mm<br><br>How to use/set mechanical pocket watch ?<br><br> Once you receive the mechanical watch:<br><br>A. Setting time<br>Pull the crown away from base of the watch and turn the crown clockwise until reaching the exact time.<br><br>B. Winding the watch<br>Push the crown back into place along the base of the watch and winding up the watch<br>clockwise rotation with 30-40 turns. The power will be full(Over winding will ultimately break the spring). Do this one time each day (before sleeping). Otherwise, it will stop working. Please do not over winding up the watch if you feel the crown is tight.