Casio F91W-1 Digital Wrist Watch Light Black Resin Band Originally a calculator company established in 1957, Casio released their first digital watch in 1974 called the Casiotron. Casio quickly became a leader of digital watch technology and have stayed on top of their market through innovation and integrity. A tried and true style great for casual wear. With its daily alarm, hourly time signal and auto calendar, you'll never need to worry about missing an appointment again. Black Casual Classic watch with a Resin Band.