Casio Watch - B640WBG-1BDF All your love for vintage in a monochrome version of a traditional Casio watch. Paying homage to the F-100, the first Casio watch designed with a resin case, the A-100 line celebrates the four iconic face buttons, adding vintage-style metallic variations for an updated version of a true classic. Retro in style but with modern functionality, this watch boasts a stopwatch, calendar, water resistance for everyday use and, of course, an LED light for easy reading in any type of lighting. Use the side closure to easily adjust the strap length for the perfect fit.