3. Watch the magnetic: if balance spring magnetized mechanical watch, watch is not accurate as well.
4. Need maintenance: the movement of walking oil aging or wear of the internal parts can cause problems, need to be sent to the designated health maintenance services.
Break or knock: watch very precise, if the items within the hit to bang may cause looseness damage can also cause problems as well. In addition to these common conditions, the influence of some environmental temperature, the influence of the wearer's habits can cause the increase of the error as well. But you don't have to worry about, please send the watch to the specified maintenance point ask professional personage to check and adjust to watch returned to normal within the error range