7827, featured a round steel case measuring 35mm in diameter and housed the Longines caliber 431, a high-frequency movement operating at 5Hz or 36,000 vibrations per hour. What set the original ...
In the late 1950s, Longines built its first ever wristwatch with a 5Hz movement, aimed at observatory chronometry competitions. Then, in 1968, the 5Hz caliber 431 made its way into a diver’s watch.
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