[KMnO4]

The F-91W is a cult classic but lacks a lot of nice features (for example, a backlight that stays on for a couple seconds after you release the button, alarm snooze, and dual time display).

I love my W-800H though. Still has a 10 year battery, nearly as compact size, and similar aesthetics.

I’ve gone through a couple over the years (the biggest flaw is the band), but my current one is incredibly accurate. Using a high speed camera, I measured 1.43 seconds loss over 6 months. Pretty sure I won the Quartz lottery since that’s much more accurate than spec, but either way I’m happy.