High-Beat Earlier this year, when Longines unveiled the Ultra-Chron Classic in New York City, I couldn’t help but smile. On my wrist was my own 1969 Ultra-Chron ref. 8024—the same model that introduced the groundbreaking Calibre 431, the high-frequency movement that made Longines a pioneer in precision timekeeping. In our previous story, The World’s Most Accurate Watch: The Longines Ultra-Chron and the Calibre 431, we … Continue reading The Longines Ultra-Chron Classic: When Past and Present Beat in Sync