F-91WS-8DF This Casio F-91W Series model features a translucent grey resin band with a matching resin case and bezel, paired with a classic digital display for a clean retro look. Built with resin glass and water-resistant construction, its slim 21 g design makes it lightweight and comfortable for everyday wear. Confirmed functions include a 1/100-second stopwatch, daily alarm, hourly time signal, auto-calendar, 12/24-hour format, and green LED light, making it a practical digital watch with distinctive transparent styling.