Bertucci Performance Watch Owner's Manual page 11

Care for your Bertucci
10 Most important: Keep crown (setting knob) screwed or rethreaded down.
Your watch is equipped with a screw down crown (setting knob). This
premium feature is the best design in order to maximize water-resistance
and durability to ensure protection of the watch movement.
Please note: After setting the time and/or date, it is critical that the crown
is tightened down by pushing in and gently turning clock-wise (to the right)
simultaneously in order rethread crown down, do not overtighten. See
illustration on page 7.
Failure to do so will potentially cause the watch's internals to be flooded with
water and voiding warranty.
Following this simple practice will extend the watch life dramatically.
Watch
®
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