🏷️ Basic Information Identification Make: Casio Model: QW-1680 Year: 1998 📋 Manual Details General Manual Type: Repair Manual Language: English Format: PDF Download Technical Scope: Complete, Internal and External Components ⚙️ Engine Specifications Powertrain Engine Type: Quartz Movement Displacement: N/A (Electronic Module) Power: Battery Powered 🔧 Transmission Gearbox Type: N/A (Electronic) Gears: N/A (Electronic) 📐 Dimensions Physical Case Diameter: Approx. 40mm (typical for this era) Case Thickness: Approx. 10-12mm (typical for this era) Lug Width: Approx. 20mm (typical for this era) 🔧 Maintenance Routine Battery Replacement Interval: 2-3 Years (typical for quartz watches) Recommended Service: Periodic cleaning and lubrication of movement components 📄 Features Watch Functions Display Type: Digital Water Resistance: Varies by specific model variant (check watch case) Alarm: Yes Stopwatch: Yes Chronograph: Yes Backlight: Yes Date Display: Yes Module Number: 1680