Zenith EL PRIMERO 21 Manual De Instrucciones página 7

3 > WINDING THE CHRONOGRAPH
Alongside the double-chain structure of the calibre, and the
remarkable accuracy this ensures, the El Primero 21 movement
boasts two other technical innovations: a new, patented start/
stop/reset mechanism composed of three heart pieces, and an
exclusive starter mechanism which ensures reliable operation
under all circumstances, and allows the chronograph second,
tenths and hundredths displays to be simultaneously reset.
Procedure
The crown must be in the 0 position, meaning that it should be
pressed against the case.
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With the watch in your hand, turn the crown clockwise until the
hand of the chronograph power reserve is fully wound (around
25 turns). The barrel that contains the mainspring has now been
wound.
Fully wound, the chronograph power reserve is around
50 minutes. This is displayed by the hand located under the
Zenith logo.
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