World's best-selling digital watch gets smart step tracking

Since 1989, Casio is said to have sold well over 100 million units of a single digital watch model. After initially winning people over with its spartan design and reliable functionality, it's since become an iconic timepiece that every collector worth their salt owns.

That watch, the Casio F-91W, is still available at just over US$20 today. But if you're interested in this historic watch, let me turn you on to its upgraded version, the F-B100W.

The quartz-powered original includes chronograph with a lap function, a daily alarm, an annual calendar, and an LED backlight to illuminate the LCD screen. A button-sized replaceable CR2016 battery can keep it going for as long as 7 years. It's all housed in a resin case with a matching integrated strap. Simple, elegant, and timeless.

The all-new F-B100W is nearly identical in appearance, but has a lot more going on inside. This...

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