The Longines Ultra-Chron Classic L2.537.4.72.6 is a 37mm stainless steel watch featuring a sunray silver dial with applied silver-polished indexes. Powered by the automatic Calibre L836.6 movement, it operates at 36,000 vibrations per hour and offers a power reserve of up to 52 hours. The watch includes a trapezoidal date aperture at 3 o'clock and is water-resistant up to 50 meters. It comes with a stainless steel bracelet equipped with a double safety folding clasp and micro-adjustment system. Reference number: L2.537.4.72.6.