The Longines Master Collection L2.257.4.78.3 is a women's automatic watch featuring a 29 mm stainless steel case and a silver 'barleycorn' dial with painted Arabic numerals. Powered by the Longines Caliber L592, it offers a power reserve of approximately 45 hours. The watch includes a date function at the 3 o'clock position and is water-resistant up to 30 meters. It is fitted with a brown alligator leather strap secured by a triple safety folding clasp with a push-piece opening mechanism. The reference number for this model is L2.257.4.78.3.