Zenith EL PRIMERO 21 Manual De Instrucciones página 6

2 > WINDING THE WATCH
Your watch is fitted with an automatic mechanical movement. The
movement is wound via the crown or the effect of the oscillating
weight. Winding via the oscillating weight takes place when the
watch is on your wrist.
When your watch has stopped
The crown must be in the position 0, meaning it should be
pressed against the case.
With the watch in your hand, turn the crown counter-clockwise.
Turn the crown 72 times to fully wind the watch. The barrel that
contains the mainspring has now been wound. In order for the
automatic winding to work properly, the watch must be worn
for at least 12 hours per day, for several days. Not wearing the
watch enough causes it to stop.
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If you do not wear your watch during the night, turn the crown a
few times the following morning before you put it on.
Having been wound, the power reserve of your watch is
around 50 hours, but this does not appear on the dial. Only the
chronograph power reserve appears on the dial of your watch.
CHRONOMETER CERTIFICATION
The El Primero 9004 movement has been certified as a
chronometer by TIMELAB in Geneva. It has been tested and
successfully meets the requirements set by the ISO3159
standard.
A chronometer is a device that measures time to the highest
accuracy, and can be adjusted to different positions and under
a range of temperatures.
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