Longines Ultra-Chron

The Longines Ultra-Chron, reference L2.836.4.52.6, is a dive watch with a 43 mm case. The watch is chronometer-certified. Measuring 13.9 mm thick and 49 mm lug-to-lug, the case has a water-resistance rating of 300 metres; the case has a screw-down crown. Self-winding calibre L836.6 has up to 52 hours of power reserve and beats at 36,000 vibrations per hour. Applied indexes accompany polished silvered hands on the black dial. A steel bracelet fastens with a triple safety folding clasp and a push-piece opening mechanism. The dial has central seconds. The dial is covered by a scratch-resistant sapphire crystal, with several layers of anti-reflective coating on both sides.