Most visitors online was 1660 , on 12 Dec 2020
One of my first jobs at Simplex was to go through a large high school and remove and replace every "donut movement I found. We were told never to fix them but replace them on sight.That USB relay looks like something fun to play with. Thanks.
You know which IBM slaves need correction? The ones with the movement with the black plastic cam. Otherwise the older International and later Simpex movements usually always run on time.