Here's something a little different - an Omega f300Hz cal. 1520 - which is one of the early Omega electric "tuning fork" watches from 1970. I've never been a fan of quartz watches, although I have a couple of solar ones, but that electric/electronic short period in between hand-wound movements and full quartz is a fascinating one. The tuning fork watches - mainly devised by Bulova - still live on in the Bulova Precisionist, and their Accutron is a well-known marque.

All sorts of makes, including Hamilton and Wittnauer, had a spell at tuning forks. They function at 300Hz - which gave them the name "hummer". If you listen closely, you'll hear that the mechanism hums just somewhere in between D and Eb above middle C!

Omega f300

This little beauty was my Christmas present last year.