The Longines Master Collection L2.257.4.78.6 is a 29 mm stainless steel automatic watch featuring a silver 'barleycorn' dial with painted Arabic numerals and blued steel hands. Powered by the self-winding mechanical movement caliber L592, it operates at 28,800 vibrations per hour and offers a power reserve of up to 45 hours. The watch includes a date function and is water-resistant up to 3 bar. It is fitted with a stainless steel bracelet equipped with a triple safety folding clasp and push-piece opening mechanism. Reference number: L2.257.4.78.6.