The Longines Master Collection Chronograph L2.629.4.78.3 is a self-winding mechanical watch featuring a 40mm stainless steel case and a silver 'barleycorn' dial. It includes a chronograph function with a 30-minute counter at 9 o'clock and a small seconds sub-dial at 3 o'clock. The watch displays the date at the 6 o'clock position. Powered by the Longines Caliber L889, it operates at 28,800 vibrations per hour and offers a power reserve of approximately 59 hours. The timepiece is water-resistant up to 30 meters and is fitted with a brown alligator leather strap secured by a triple safety folding clasp with a push-piece opening mechanism. Reference number: L2.629.4.78.3.