You're right on it probably stopping after a while. in this video you can see the points starting to burn already (view full size).

For better or worse I sprayed it down liberally with Deoxit D5, and it really cleaned and de gummed the entire works. everything seemed to loosen up. And I have used no lube anywhere, maybe the Deoxit actually lubes a little bit?  I had to bend and prod both contacts to get them at least somewhat in line. Did a little diamond filing of the contacts, but they obviously need more work to contact flat. The weighted throw/contact section is worn out on its inside bearing, and is loose. Maybe my other clock will be better.

The thing about these earlier clocks is that the adjustment knob and shaft must separated from the brass gear to be removed, I'll not bother. (you can see that gear, upper left in vid below). But one good thing is the lens can be swung out to clean and polish it. The later Borg clocks, you can unscrew the knob from the shaft.

I did let it run overnight, and after 12 hours it was still being wound, and did keep good time. I think one could preserve the life of this type of clock, by setting up a little switch underdash to kill it's power when not in use. It's the thousands of cycles that will kill it. I'm going to do just that, because I like the sound that a real clock will make in car.

Here's a little video of the throw winding mechanism in action. I've never seen a video of the inside works. I'm breaking new ground here lol!