The Longines Master Collection Chronograph Moonphase L2.773.4.61.2 is a self-winding mechanical watch featuring a 42 mm stainless steel case and an anthracite dial. It offers a chronograph function, moon phase display, and a power reserve of up to 66 hours. The watch is equipped with a scratch-resistant sapphire crystal with anti-reflective coating on both sides and is water-resistant up to 30 meters. The grey alligator leather strap includes a triple safety folding clasp with a push-piece opening mechanism. Reference number: L2.773.4.61.2.