Knowing how much energy your automatic watch has left is a small but satisfying luxury, and the Longines Master Collection 38.5mm Power Reserve puts that information right on the dial. A dedicated indicator shows remaining reserve at a glance, so you always know whether it will last through the weekend on the nightstand.

Reference L2.708.4.51.7 pairs a black guilloche dial with Roman numerals and feuille hands in the classic Master Collection manner, adding a date display for good measure. Power comes from caliber L602, an automatic based on the ETA 2897 with about 42 hours of reserve, and the sapphire caseback reveals it in motion.

On a leather strap the 38.5mm steel case wears slim and elegant, a natural match for evening wear and business attire. It is a refined pick for someone who wants a dress watch with a functional complication that is genuinely used every day.

Master Collection Power Reserve on Leather, L2.708.4.51.7

• Case: 38.5mm stainless steel
• Dial: black guilloche with Roman numerals
• Indications: hours, minutes, seconds, date, power reserve
• Movement: Longines L602 automatic
• Power reserve: approximately 42 hours
• Crystal: sapphire with anti-reflective coating; display back
• Water resistance: 30 meters
• Strap: leather, 20mm lug width

Dark, distinguished and genuinely informative: a dress watch with a useful twist.