B640WBG-1B This Casio Vintage model features a black ion-plated stainless steel band with a black resin case and a black digital display with a glitter face design for a refined retro look. Built with resin glass and 50-meter water resistance, it offers a slim lightweight profile suited to dependable everyday wear. Confirmed functions include LED backlight with afterglow, a 1/100-second stopwatch, countdown timer, multi-function alarm, hourly time signal, flash alert, and full auto-calendar, making it a practical choice for users who want classic digital utility with a darker vintage finish.