SDB-300W and its descendants are still unmatched as a runner's wristwatch. Just give me a watch with buttons like that that reliably trigger instantly with a satisfying beep.

Is there anything like that around, suitable for timing to the 0.1s level?

Timex Ironman has a nice big start/stop button, plus some running-oriented features. Most models also have the Indiglo backlight which I like.

https://timex.com/products/ironman-classic-30-mid-size-resin...