The Casio F-91W is a compact, rectangular digital watch featuring a black resin case and strap. Its face includes a digital LCD display surrounded by a black bezel with blue and red accents. Text on the bezel includes:
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“CASIO” at the top left
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“F-91W” at the top right
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“ALARM CHRONOGRAPH” beneath the top line
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Labels such as “LIGHT”, “MODE”, and “ALARM ON/OFF/24HR”
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A red-highlighted “WR” indicating water resistance
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“WATER RESIST” at the bottom
The display shows time (in 24-hour format in the photo), day of the week, and date. There are three buttons—on the left and right sides—for controlling the functions.
This watch is known for its reliability, simplicity, and long battery life, making it a cult favorite among minimalists and collectors.




