BREIL OS20 Mode D'emploi page 10

Chronograph reset [incl. after replacing battery]
This procedure should be performed when the chronograph second hand does not
return to the 0 second position after the chronograph has been reset, and including after
the battery has been replaced.
1. Pull the crow out to the 2nd position.
2. Press button to set the chronograph second hand to the 0 position.
3. The chronograph hands can be advanced rapidly by continuously pressing button
4. Once the hands have been zeroed, reset the time and return the crown to its normal position.
* Do not return crown to normal position while chronograph second hand returns to
12:00 (ZERO) position. Hand stops on the way if the crown is returned to normal
position and these positions are recognized as 12:00 (ZERO) position.
6
or .