What accuracy can I expect from an automatic watch?
1 November 2006
If a watch movement has been tested by COSC (Control Officiel Suisse des Chronometres) or any other similar organization and a certificate of a Chronometer was issued, its accuracy is within +/- 8 seconds per day.
For all other movements, anything up to 30 seconds fast or slow would be considered acceptable. Most new watches should be given a few weeks to adjust to your body rhythm before any adjustments should be made.
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