The Longines Master Collection Power Reserve (Reference L2.666.4) is a sophisticated Swiss luxury watch that blends timeless dress watch styling with helpful mechanical features.

• The Dial: Features a striking black "barleycorn" textured guilloche dial. It is decorated with crisp white Roman numeral hour markers and elegant leaf-shaped silver hands.
• The Power Reserve: A special crescent-shaped sub-dial sits at the bottom of the face (above the 6 o'clock position). It acts like a fuel gauge for the watch, showing how many hours of mechanical energy are left before it needs to be wound again.
• The Case: Crafted from polished stainless steel with a bold 42mm diameter. This size gives it a modern, commanding presence on the wrist compared to traditional 38mm or 40mm dress watches.
• FeatureSpecification
• Case Size42mm diameter
• Case MaterialPolished Stainless Steel
• MovementSwiss Automatic (Self-winding mechanical)
• Dial ColorBlack with textured Guilloche patternComplicationsDate window (at 3 o'clock) & Power Reserve indicator
• CrystalScratch-resistant Sapphire crystal
• Case BackTransparent sapphire display back (exposing the moving balance wheel and rotor)Water Resistance30 meters (3 bar / 100 feet) — splash resistant