About The Crown - Citizen Eco-Drive 8637 Instruction Manual

About the crown
Some models use screw down system for the crown. Accidental operations can be
prevented when the watch is not being operated by locking the crown. To operate
the watch, release the lock.
Before operation
Unlock the crown
Rotate the crown to the left
(counterclockwise).
When the screw lock is released, the
crown extends to the normal position.
After operation
Lock the crown
Press the crown and rotate it to
the right (clockwise) to tighten the
screw lock.
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