The Longines Master Collection Chronograph Moonphase L2.773.4.92.0 is a self-winding mechanical watch featuring a 42 mm stainless steel case and a sunray blue dial. It offers a chronograph function, moon phase display, and a power reserve of approximately 66 hours. The watch is water-resistant up to 30 meters and is fitted with a blue alligator leather strap secured by a triple safety folding clasp with push-piece opening mechanism. Reference number: L2.773.4.92.0.