![]() In fact, the El Primero is capable of timing events down to one-tenth of a second. The significance of this high frequency, other than making for a smoother traveling seconds hand, is in making the chronograph more precise and enabling it to subdivide time into smaller segments. The balance wheel swings back and forth an astonishing 36,000 times per hour (that’s ten times per second). ![]() The El Primero movement is unique not only for being the first automatic chronograph, but also due to the high speed at which the movement’s balance oscillates. But in that year that saw the space race reach its zenith, the world also saw another sort of race - one that culminated with Zenith’s creation of the world’s first integrated full-rotor automatic-winding chronograph: the El Primero. ![]() Before 1969, chronographs were all hand-wound the problem of integrating a self-winding mechanism into the tight space of a chronograph movement was yet unsolved.
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