![]() ![]() Movement: Self-winding El Primero 400 Automatic hours and minutes in the centre. Which perfectly allows us to segue to talk about the movement powering the Zenith Chronomaster Revival A3817, the contemporary, self-winding El Primero 400, which clocks in with a frequency of 36,000vph, or 5 Hz, and is the sole reason why the watch is able to measure time 1/10th of a second.
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