The Longines Master Collection Moonphase L2.919.4.77.6 is a 42mm stainless steel watch featuring a silver 'barleycorn' dial adorned with diamond hour markers. It is powered by the self-winding mechanical movement caliber L899.2, operating at 25,200 vibrations per hour and offering a power reserve of up to 72 hours. The watch includes a moonphase and date indicator sub-dial at the 6 o'clock position. It is water-resistant up to 3 bar and protected by a scratch-resistant sapphire crystal. The stainless steel bracelet is equipped with a triple safety folding clasp and push-piece opening mechanism. Reference number: L2.919.4.77.6.