Casio F-91W Digital Watch

The Casio F-91W is the most iconic digital watch ever made. Introduced in 1989 and unchanged since, this watch does everything you need and nothing you don't: tells time, date, has a stopwatch, alarm, and LED backlight.

The 7-year battery life on a single CR2016 battery is legendary. Water-resistant to 30 meters handles rain and handwashing (not swimming). The resin case and band are virtually indestructible — these watches survive daily abuse for decades.

At 38mm case width and weighing just 21 grams, it's compact and unobtrusive on the wrist. The black face with white digits is readable in any lighting condition. The single button backlight illuminates the display for nighttime viewing.

This watch has achieved cult status: worn by everyone from Navy SEALs to fashion icons. The ultimate "it just works" timepiece. When the battery finally dies after 7+ years, replacing it costs $5.