Hamilton acquired the Swiss manufacturer, Buren in the mid-1960's and around that same time Hamilton started using Buren's movements in the "thin-related" watches. This included the Thinline models and the Thin-o-Matics. Other Swiss-makers were used too but Buren movements were used predominantly - especially in the Thin-o-Matics.
One of the Buren-based models is the TM-6800. It was introduced only in the 1968/69 catalog.
The TM-6800 comes in a single-piece 10K RGP case that opens through the crystal.
Tucked inside is a Hamilton 628 movement, which is a micro-rotor movement from Buren. This movement has a beat rate of 6 beats per second, or 19,600 beats per hour, as opposed to the typical 18,000 BPH rate in most vintage watches.
I recently acquired a TM-6800 project watch that came on an interesting bracelet. It sort of matches the catalog but it's not an exact match, so I don't know if it's original but it's surely from the same period.
These micro-rotor movements have a gazillion tiny parts in them and I really don't like working on them. So I sent this one out for service rather than risk screwing it up myself. Oddly enough, someone had installed the wrong sized rotor (oscillating weight) and I had to replace it with the correct one (shown below).
And here's the finished watch, on it's pillow shot. It's a sharp-looking watch and lives up to it's aspiration to be thin. It's definitely very thin for a self-winding watch and more along the lines of a manual winder.
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