Longines Ultra-Chron: The World's First High-Frequency Dive Watch Retu
The Longines Ultra-Chron takes its most direct inspiration from a dive watch the brand introduced in 1968, but it also represents the culmination of Longines’ expertise in making high-frequency watch movements, which goes back more than 100 years. Longines’ century-plus quest for high-frequency timekeeping precision started in 1914, when it produced the first hand-held stopwatches (like the one below) with movements that measured time to 1/10 second thanks to their high-frequency movement, Caliber 19.73N, whose balance wheel oscillated at 36,600 vph. It continued with a modification of that caliber to achieve an astonishing rate of 360,000 vph, and a stopwatch accuracy of 1/100 second, in 1916; hit a new milestone with the launch of the Observatory Chronometer in 1959, the first wristwatch with a 36,600-vph movement; and culminated with the introduction of the Ultra-Chron Diver (below) in 1968, which became the world’s first high-frequency divers’ watch, housing the 36,600-vph Caliber 431. (Yes, this predates by one year the most famous high-frequency movement, the Zenith El Primero, though that movement also incorporated automatic winding and a chronograph.) The Ultra-Chron Diver provides the template for the all-new Ultra-Chron model, whose cushion-shaped stainless steel case spans a contemporary 43mm in diameter and 13.6mm thick as well as a 300-meter water resistance - an improvement on the vintage model’s 200-meter rating. Like its predecessor, and in th...
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