The Casio F-91WS-7EF is a modern take on the beloved F-91 series, first released in 1989. This iteration combines a skeleton band with a metallic-painted case, offering a fresh and sophisticated aesthetic.

• Case size: 38.2 × 35.2 × 8.5 mm
• Weight: 21 g
• Case and bezel material: Resin
• Band material: Resin
• Band color: Skeleton
• Case finish: Metallic paint
• Glass: Resin glass
• Water resistance: Daily use water resistance
• Battery life: Approximately 7 years (CR2016)
• Stopwatch: 1/100 second, 60-minute timer, split time
• Alarm: Time alarm and hourly time signal
• Light: LED backlight (green)
• Calendar: Auto calendar
• Display: 12/24 hour format switching
• Accuracy: ±30 seconds per month