The Hamilton name lives on in a pretty good watch.
In 1966, Hamilton aquired Buren of Switzerland, and moved there in 1969. The Buren-Hamilton microroter was a small movement automatic.
It was bought by Omega-Tissot in 1971.
Omega-Tissot merged with ASUAG to form the Swatch group.
Their better movements are made in their ETA factory in Switzerland. ETA is the largest maker of Swiss movements. Eta 2824-2 movement is a 25j automatic, the 7750 var. has stopwatch capabilities.
The ETA 2892 is 21j (to 25j) with three grades, the top adjustable to 5 positions and temperature and, with specs of -4/+4 seconds/day, meets COSC specs of -4/+6 seconds/day, matching the best of the old pocket watches.

Omega Seamaster, current model, is a 2892 (omega 1120); with addition of a coaxial escapement it becomes the Omega 2500 series.

The top movements, in Omega, IWC and Breitling, match Rolex in quality, although purists will argue about this.

Don't ask me to explain any of the above, which I found out by looking at several websites, and was caused by an adv. for Hamilton Jazz Maestro automatic chronometer, ETA 7750, in the NY Times for $1845.