The ubiquitous Valjoux 7750 runs at 28,800 alternations per hour, which I believe is more than sufficient precision for a chronograph. Although this technically permits resolution down to 1/10th of a second, I have my doubts that human reaction time makes this truly useful. According to Zenith, the El Primero is the only chronograph movement currently in production that runs at 36,000 alternations per hour. The movementĬontains 280 components, of which 225 are different. This is a 31 jewel movement which is 30mm in diameter, and 6.5 mm thick. The Class 4 contains the well known El Primero cal. Please note that this watch has now been renamed the Class El Primero in the 1999 Zenith literature.
For those who are interested, click here for the Zenith company Web-Site. At the bottom of the page, there are links to MANY pictures I have taken of this watch. This is a review of the Zenith Class 4 chronograph.
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