F-91W-3DG This classic Casio F-91W model features a black resin band with a matching black resin case and bezel, paired with a digital display accented by distinctive green detailing for a clean retro look. Built with resin glass and water-resistant construction, its slim 8.5 mm profile and lightweight 21 g design make it 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 everyday digital watch with timeless black-and-green styling.