Casio Edifice x Sospensione ft. 50th Anniversary (Limited Edition) Men Casual Formal Round 100m Water Resistant Watch EFS-S640ZE-1A EFSS640ZE EFSS640 EFS-S640 EFS-S640ZE Celebrate 50 years of Casio watches with the unique EDIFICE EFS-S640ZE, a solar-powered chronograph in a striking black and gold design. It features a gold band loop engraved with 50th ANNIVERSARY and a dial with binary code, showcasing Casio innovation. Made from carbon fiber-reinforced resin and inspired by motorsport, it combines style and sustainability with an eco-friendly Alcantara band. Module / Movement 5585 (solar powered) Power Reserve / Accuracy Approximately 5 months without exposure to light (+/-20 seconds per month) Crystal Sapphire crystal (anti-reflective coating) Luminous Luminous on hands Case / Band Material Carbon / stainless steel / aluminum case with alcantara material band Water Resistance 100m / 10 bar Case Size Thickness: 13.8 mm Diameter: 44.5 mm Length: 50.1 mm Other Specifications Casio Edifice x Sospensione ft. 50th Anniversary (Limited Edition) Chronograph up to 30 minutes in 1-second increment (elapsed time, split time) Battery level indicator Low battery alert Date and 24-hour display Regular timekeeping (analog display)