About This Watch: This Longines Master Collection Watch L27735787 or L2.773.5.78.7 has a moon phase chronograph (automatic), self winding movement with a month-day window. It features a silver dial and a scratch resistant sapphire crystal. Its finely crafted 42 mm case is made out of 18k yellow gold. This watch is water resistant up to 3 bars; 100 feet; 30 meters.