In 1914, Longines crafted a high-frequency stopwatch (5 Hz) complete with a split-second hand and manual counter with three pushers. The high-frequency calibre 19.73N hand-wound mechanical ...

The Ultra-Chron story began in 1966 when Longines introduced the world's first mass-produced high-frequency precision watch. This groundbreaking timepiece, known as the Ultra-Chron ref.