Longines Ultra-Chron Classic

The Longines Ultra-Chron Classic, reference L2.937.4.72.6, has a 40 mm round case in steel. The watch is chronometer-certified. The case is 10.95 mm thick and 47.2 mm lug-to-lug, with water resistance rated to 50 metres. Self-winding calibre L836.6 provides up to 52 hours of power reserve and beats at 36,000 vibrations per hour. A scratch-resistant sapphire crystal covers the hour and minute display, with several layers of anti-reflective coating on both sides. A steel bracelet fastens with a double security folding clasp with a micro adjustment system. A date display and central seconds appear on the dial. The sunray silver dial carries applied indexes alongside polished silvered hands.