1963 Bulova Accutron. I believe this is the "401" variant.
Recent purchase online for a reasonable price. 10K Gold Filled case and case back. A few scratches on the crystal, but nothing that can't be fixed pretty easily.
Unfortunately, my other Accutron needs an index wheel, so I bought another one to satisfy my need for a working example while I try to find a good index wheel for my other one.
Runs accurately and hums along nicely! Accutrons are truly an engineering marvel!
I would take a picture of the movement, but an Accutron is something I'm a little more afraid to open myself than a regular watch. I would have my jeweler open it so I could snap a quick picture, but they send out watches to a watchmaker that doesn't work inside their store.