B.R.M FF39-40 Notice D'utilisation page 6

Your B.R.M Chronographes watch was manufactured, assembled and
checked with the utmost care by our watch-makers.
To ensure longevity please read the following instructions carefully.
Time setting
Your automatic watch has an approximately 38 extra working hours.
If the watch isnot worn daily, the extra hours will run out and the watch will
stop.
To set your watch, put the winder in position 2. After setting, bring it back to
the 0 position.