So I'm a bit of a watch nut, and I recently acquired a 1968 Bulova Accutron Spaceview.
It has a tuning fork movement, called the Accutron 214. For those that aren't familiar, the tuning fork 214 movement is an engineering feat. It moves the second hand at 360Hz, so instead of a ticking, you hear a faint hum. As much as I'd like to go on and on about it, its not really car related, so here are a couple pictures of it. The first is the watch itself, the second is the 1968 Spaceview next to the 2014 "remake" of it.