The second mechanism is linked to the El Primero 9004 by common plates and bridges.Īlthough the movement for the time display can be wound either by turning the crown counterclockwise by hand or automatically, by the motion of the rotor, the barrel for the chronograph mechanism can only be wound manually. A fully wound barrel requires 25 turns of the crown.īehind this fascinating watch movement is a completely independent and separate chronograph mechanism that includes energy storage, a gear train, and a regulator. The power for the chronograph is sufficient for about 50 seconds if the wearer hasn’t wound the crown in the meantime. This counter, at 3 o’clock, shows 30-time units in a conventional way. In contrast, the elapsed minutes hand advances by one position each minute. If the elapsed seconds hand stops in this area, it’s harder to read the result because of the distorted line markers.ĭue to the high frequency of the chronograph, the small elapsed seconds hand also appears to move at a rapid speed. But by exposing the balance wheel, the otherwise easy-to-read lapsed seconds is interrupted by a concave section in the circle between seconds 40 to 52. So, for example, you can read 24 seconds, 7/10 of a second, and 3/100 of a second: 24.73. The full seconds time unit is displayed on a counter at 6 o’clock. Cleanly applied numerals in 10-digit increments mark 1/10 seconds, and intervening index lines show 1/100 seconds. If the pusher at 2 o’clock is pressed again, the central chronograph hand stops immediately and shows the fractions of a second indicated by the elegant sword-shaped hand. The 1/100-second measurement is precisely displayed on the raised dial ring where it can be easily read. This permits the measurement and display of 1/100-second intervals: 360,000 vph equals 100 beats per second, with as many steps by the hand in the same time interval. And inside the titanium case, the mechanism that makes this possible hums along at this high-speed pace, with an oscillating system that beats at a rate of 360,000 vph. It only needs 1 second for each rotation. Starting the chronograph of the Zenith Defy El Primero by pressing the large rectangular pusher at 2 o’clock comes with a huge surprise: a long, thin hand spins around the dial at lightning speed.
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