When buying a new IWC watch, the first thing you should do is run the watch in by wearing it every day. If necessary, the watch should be readjusted after the running-in period. Mechanical watches need to run for a certain time until they become stable.
IWC runs in its watches under controlled conditions at the production stage and checks the rate of the movement is checked using a timing machine and by observing its behaviour over a certain period of time. This usually takes place at room temperature and with simulated sequences of movements. On the wearer's wrist, however, conditions may be completely different, which would result in a different rate from the one recorded during the test at the production stage.
Keep an eye on the deviations and note down how much the watch gains or loses every day.
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