Philippe E. 12/01/2026
| Reference Ocarat | #112936 |
| Reference | EFS-S640PB-1AVUEF |
| Brand | Casio Edifice |
| Product Type | Watch |
| Gender | Men |
| Color | Black Gray |
| Material | Carbon Synthetic |
| Material Quality | Carbon fiber Resin |
| Warranty | 2 Years |
| Length (in mm) | 50,10 |
| Thickness (in mm) | 13,30 |
| Diameter (in mm) | 44,50 |
| Manufacturing | Japan |
| Labels and Certificates | Authorized Retailer |
| Case Shape | Round |
| Case Weight (in g) | 59,00 |
| Bezel | Fixed Ion plating Stainless Steel |
| Dial Finish | Carbon Fiber |
| Watch Case Back | Case back secured by screws |
| Glass Quality | Sapphire Crystal |
| Glass Treatment | Anti-Reflective Coating |
| Watch Case Types | Date |
| Buttons | 1 Crown 2 Pushers |
| Water Resistance (in ATM) | 10 |
| Movements | Solar |
| Movement Type | Japanese Movement |
| Calendar and Time | Dates Hours Minutes |
| Chronograph Function | Yes |
| Counters and Durations | 24h 30 min Small seconds |
| Timekeeping and Measurement | Chronograph Chronometer |
| Display Type | Analog (hands) |
| Display Specifications | Indices and railroad track Luminescent hands and indexes Neobrite |
| Number of Counters (Additional) | 3 |
| Bracelet Material | Resin |
| Strap Color | Black |
| Watch Clasp | Tang Buckle |
| Lug Width (in mm) | Special - Custom Made |
| Connectivity and Display | Watch battery charge level |
Casio has been a watchmaking icon for over a century, consistently delivering high-quality timepieces at accessible prices. The brand offers multiple collections for different lifestyles - from everyday wear to outdoor adventure. From the Casio Edifice collection, meet the bold EFS-S640PB-1AVUEF, engineered to impress on men's wrists. Its black case is built from carbon fiber-reinforced resin, shaped in a round form measuring 44.50 mm in diameter, 50.10 mm lug-to-lug, and 13.30 mm thick, weighing in at 59 g - proportions that sit perfectly on a man's wrist. The fixed bezel is crafted from stainless steel enhanced with ion plating in a sleek gray finish and features a minute scale. A sapphire crystal with anti-reflective coating protects the dial from daily scratches and impacts while maximizing readability. A crown and two pushers at 2, 3, and 4 o'clock provide easy access to all functions. The case back delivers a water resistance of 10 ATM.
This stunning carbon fiber dial reveals a woven black background. Its perimeter features a minute track paired with luminescent hour markers. At the center, two hands indicate the hours and minutes, while the chronograph seconds hand sweeps the seconds. Both the main hands and the markers they pass over are treated with Neobrite for enhanced legibility in the dark. A date window sits at 4 o'clock, and three sub-dials are positioned at 6, 9, and 12 o'clock to display small seconds, charge level, 30-minute elapsed time, and a 24-hour indicator. Finally, Casio signs the dial with the collection name at 3 o'clock.
Solar Power
Invisible solar cells built into the watch convert light into energy to power all functions. A rechargeable battery stores enough capacity to keep the watch running in low-light conditions.
Neobrite Coating
The hands and/or markers feature a fluorescent coating that continues to glow in the dark after the watch has been exposed to a light source.
Stopwatch Function - 1/1 sec - 30 min
Timing is measured to the nearest second, up to a maximum duration of 30 minutes.
Carbon Fiber Dial
The watch's carbon fiber dial commands attention with its striking gradients of black and gray.
Battery Level Indicator
Displays the current battery level.
This model is powered by a highly reliable Japanese solar movement with an accuracy of ±20 seconds per month and a power reserve of approximately 5 months from full charge to the moment the hands stop.
This stunning strap is crafted from black resin, delivering a highly flexible fit with a distinctive design and outstanding comfort on men's wrists. It fastens securely with an easy-to-use pin buckle.
With 100-meter water resistance - that's 10 ATM in watchmaking terms - this bold timepiece transitions seamlessly from black-tie events to the water. Feel free to wear it in the shower, the bath, or while swimming (even during intense, high-energy laps). That said, our watchmaking experts want to be clear: this model is not designed for scuba diving, freediving, or high-pressure water jets. Remember: showers, baths, and swimming only - and keep those pushers and crown dry!



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Philippe E. 12/01/2026
Solar Chrono Sapphire Watch EFS-S640PB-1AVUEF
(Ref. 112936)