B640WMR-5A This Casio Vintage model features a rose gold-tone stainless steel mesh band with a resin case and a digital display for a clean retro-inspired look. Built with resin glass and 50-meter water resistance, it offers a slim lightweight profile suited to dependable everyday wear. Confirmed functions include a 1/100-second stopwatch, countdown timer, daily alarm, hourly time signal, auto-calendar, LED backlight with afterglow, and flash alert, making it a practical choice for users who want classic digital utility with a refined vintage finish.