Victorinox CHRONOGRAPHS Watch - Manual (Page 41)

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MECHANICAL: SELF-WINDING THREE-HAND WATCHES
NOTE: Your watch will have either a “pull-out” or “screw-down” crown.
To determine this, gently try to pull out the crown to position (2). If it does
so, your watch has a pull-out crown. If not, use the thumb and forefinger
to apply mild pressure on the crown while rotating toward you to release
it. If it does so, your watch has a screw-down crown. Turn crown towards
you to release. After use, push the crown back to position 1, then press
and screw down the crown (to ensure a tight seal).
Winding
The watch is wound automatically when worn on the wrist. If the watch is
not worn on a daily basis, the movement will have to be wound manually
by turning the crown away from you at least twenty times in position (1).