Accurist 6W50 Operating Instructions Manual page 39

OS80 & OS81 Operating Instructions continued . . .
To reset chronograph hands:
This procedure should be performed when the chronograph second hand and
chronograph 1/20th second hand do not return to the 0 second position after
the chronograph has been reset, and including after the battery has been
replaced.
1. Gently pull out crown to Position C.
2. Press TR Button to set the chronograph second hand to the 0 position.