Sapphire Solar Chrono Watch EFS-S640DC-1AVUEF

The Watch

The iconic Casio brand has built a reputation for watches known for their durability, shock resistance, and distinctive design - crafted to withstand extreme conditions and beloved by sports and outdoor enthusiasts. From the Casio Edifice collection comes this striking Solar Chrono Watch with a bold sporty attitude. It features a round case crafted in carbon fiber-reinforced resin with a sleek black ion-plated finish. The case is topped by a sapphire crystal with anti-reflective coating, providing superior protection against scratches and impacts while maximizing dial readability. It sits within a fixed bezel in stainless steel graduated from 0 to 60. The case measures 44.50 mm in diameter, 13.30 mm thick, with a lug-to-lug length of 50.10 mm - ideal proportions for men's wrists. All functions are adjusted via the crown and two pushers located at 2, 3, and 4 o'clock. A screw-back case provides water resistance of 10 ATM, equivalent to 100 meters depth.

The Dial

The dial of this timepiece strikes a perfect balance between function and style. Its black base is enhanced by a wave-pattern finish that draws the eye. The outer edge features a minute track and luminescent indices marking the hours. These markers, along with the two central hands above them, are treated with Neobrite coating for easy reading in low-light conditions. The hands indicate hours and minutes, while the red seconds hand tracks the chronograph seconds. Three sub-dials at 6, 9, and 12 o'clock display small seconds, battery level, 30-minute and 24-hour counters. A date window sits at 4 o'clock, while the collection name is displayed at 3 o'clock.

Functions

Solar Power

Invisible solar cells built into the watch convert light into energy to power all functions. A rechargeable battery provides the capacity needed to keep running in low-light conditions.

Neobrite Coating

The hands and/or indices are coated with a fluorescent material that continues to glow in the dark after the watch has been exposed to a light source.

Stopwatch Function - 1/1 sec - 30 min

Timings are measured to the nearest second, up to a maximum duration of 30 minutes.

Carbon Fiber Dial

The carbon fiber watch dial commands attention with its striking interplay of black and grey gradients.

Battery Level Indicator

Displays the current battery level.

The Movement

The solar movement powering this watch is Japanese-made. It delivers an accuracy of ±20 seconds per month and offers a power reserve of approximately 5 months from full charge to stopped hands.

The Bracelet

The stunning bracelet paired with this timepiece is crafted in black ion-plated stainless steel. Built to last, its brushed finish adds a refined edge that complements any men's outfit. This bracelet features a triple-folding clasp and fits wrists ranging from 150 to 205 mm.

Water Resistance

This model offers water resistance of 10 atmospheres, or 100 meters - making it a genuinely water-resistant timepiece. It's ready to splash around with you in any aquatic setting, from puddles to the pool. Showering, bathing, and recreational swimming? No problem. That said, our watchmaking experts note that while this model is water-resistant, it is not suitable for diving (professional or recreational) and should be kept away from high-pressure cleaning equipment. We also recommend avoiding use of the crown or pushers while submerged.