About This Watch: This Longines Master Collection Watch L27154713 or L2.715.4.71.3 has an automatic, self winding movement with a retrograde day-date format. It features a silver dial and a scratch resistant sapphire crystal. Its finely crafted 41 mm case is made out of stainless steel. This watch is water resistant up to 3 bars; 100 feet; 30 meters.