F-91W-1DG This classic Casio F-91W model features a black resin band with a matching black resin case and bezel, paired with a clear digital display and signature blue, red, and yellow dial accents. Built with resin glass and water-resistant construction, its slim lightweight design makes it comfortable for everyday wear. Confirmed functions include a 1/100-second stopwatch, daily alarm, hourly time signal, LED light, auto-calendar, and 12/24-hour format, making it a practical and timeless digital watch for daily use.