CONCORD Quartz Instruction Manual page 8

Important
Quick date setting:
as for all mechanical watches equipped with a calendar, the quick date
setting (crown in position I) MUST NEVER be carried out between 9pm
and 3am.
Water-resistance:
once the time/date setting is finished, you must screw the crown back
again 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.
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Instruction manual
quartz chronograph
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