Casio Edifice EFS-S660D-1AEF Men's Watch Silver • Sapphire Crystal • Solar Chronograph

The Casio Edifice EFS-S660D-1AEF is a solar-powered chronograph that combines motorsport aesthetics with functional precision in a slim stainless steel case. With a case diameter of just 38.3 mm and overall dimensions of 45.3 × 38.3 × 11.6 mm, the watch sits comfortably on the wrist and impresses with its clean, understated design. The dial features a refined textured finish that allows sufficient light to reach the built-in solar cell for continuous charging, ensuring reliable long-term operation without battery replacement.

A central seconds hand enables precise time measurement to 1/20 of a second. The tachymeter scale on the bezel allows average speed calculations. The premium sapphire crystal with anti-reflective coating protects the dial from scratches and glare. A stainless steel bracelet with a triple-folding one-touch clasp and water resistance to 10 bar complete the package for active wearers. The stopwatch measures elapsed time, split time, and the times of the first two finishers.

Key Features of the Casio EFS-S660D-1AEF Watch

• Solar power with low-charge warning: Reliable energy supply via solar charging, with a low-battery alert and an operating time of approximately 5 months from full charge to hand standstill.
• Sapphire crystal with anti-reflective coating: Premium crystal protection for optimal legibility and outstanding scratch resistance in everyday use and sport.
• 1/20-second stopwatch with tachymeter: Precise chronograph with three measurement modes and a tachymeter bezel for calculating average speeds.

Care Instructions for Wristwatches

Care & Cleaning

• Daily: Wipe case and bracelet with a soft, dry cloth to remove dirt and perspiration.
• Water-resistant watches: Clean with mild soapy water and a soft brush, rinse, dry thoroughly.
  Important: Screw down the crown firmly beforehand!!!
• Not water-resistant: Clean only dry or slightly damp, do not use water or cleaning agents.
• Avoid: Harsh chemicals, perfume, cosmetics and heat.
• Leather straps: Do not soak, clean only slightly damp and allow to dry away from heat.
• Water resistance: Do not wear in the shower or bath, have it checked annually.
• Battery (quartz): Have a depleted battery replaced immediately.
• Mechanical watches: Service by a master watchmaker every 5 years.

Storage & Handling

• Store the watch separately, not in direct contact with other jewellery (risk of scratching).
• When winding mechanical watches, lay them down; do not leave the crown pulled out.