Longines Ultra-Chron Classic

The Longines Ultra-Chron Classic, reference L2.537.4.72.6, has a 37 mm round case in steel. The watch is chronometer-certified. Measuring 10.95 mm thick and 44.6 mm lug-to-lug, the case has a water-resistance rating of 50 metres. Self-winding calibre L836.6 has up to 52 hours of power reserve and beats at 36,000 vibrations per hour. The dial is covered by a scratch-resistant sapphire crystal, with several layers of anti-reflective coating on both sides. Applied indexes accompany polished silvered hands on the sunray silver dial. The dial has a date display and central seconds. A steel bracelet fastens with a double security folding clasp with a micro adjustment system.