Longines Master Collection

The Longines Master Collection, reference L2.910.4.78.6, has a 40 mm round case in steel. The watch has an annual calendar and a month display. The case is 10.8 mm thick and 46.8 mm lug-to-lug, with water resistance rated to 30 metres. Self-winding calibre L897.2 provides up to 72 hours of power reserve and is visible through a transparent case back. A scratch-resistant sapphire crystal covers the hour and minute display. A steel bracelet fastens with a triple safety folding clasp and a push-piece opening mechanism. A date display and central seconds appear on the dial. The silver barleycorn dial carries painted Arabic numerals alongside blued steel hands.