What causes rate deviations?
Normally the movement of valued watches is adjusted in different positions to an average of -0 / +7 seconds per day. That is a valued watch never gains or loses a few seconds over the period of time, but more precisely, it always varies with the same value. It differs from movement to movement. The owner’s individual habits of wearing also play a decisive role in the rate variations. An automatic movement of an energetic person runs differently than that of a rather calm person. Thus a deviation in rate is primarily a matter of timing check and habit’s of wearing, not a matter of function. This is different when you have an already repaired watch.
