CONCORD AUTOMATIC CHRONOGRAPH 3 Instruction Manual page 34

IMPORTANT
Quick date setting:
as for all mechanical watches equipped with a calendar, the quick date set-
ting (crown in position I) MUST NEVER be carried out between 9pm and 3am.
Water-resistance:
once the time/date setting is finished, you must push the crown back again
to position 0 in order to guarantee perfect water resistance. To do this, push
the crown in to position 0 and turn it in a clockwise direction.
It is recommended that the crown and pushers not be handled under water.
AUTOMATIC CHRONOGRAPH 1 34