The quartz movement, designated Module 593, is powered by a single CR2016 3-volt lithium button cell. According to manufacturer estimates, the watch is reported to be accurate to ☓0 seconds per month. The watch uses a faint, green LED backlight located to the left of the display for illumination (in earlier versions it was an amber microlight).
Other features include an hourly time beep and a single daily alarm lasting 20 seconds and an annual calendar, with adjustment for leap years not supported as the watch does not record the year. The stopwatch also has the feature to mark net and split time (lap). The F-91W is a chronograph, featuring a 1⁄ 100 second stopwatch with a count up to 59:59.99 (nearly one hour). The resin strap is 18 millimetres (0.71 in) at the fitting and 22 mm across the widest part of the lugs. The case is primarily made of resin, with a stainless steel caseback and buttons, with the manufacturer's module number, 593, stamped on the caseback. Specifications Design ĭesigned by Ryusuke Moriai as his first design for Casio, the case of the F-91W measures 37.5 by 34.5 by 8.5 millimetres (1.48 by 1.36 by 0.33 in).
As of 2011, annual production of the watch is 3 million units, which makes it the most sold watch in the world. Introduced in 1989 as a successor of the F-87W, it is popular for its low price and long battery life. The Casio F-91W is a digital watch manufactured by Japanese electronics company Casio. Casio F-91W-1 watch with a resin case and resin strap
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