I came across this video.

I lasts 20 mins and a bit slow but is very interesting from the production point of view.

Look out for 14.20 mins about dust collection.

Please forgive me if this has already been posted.

What Makes a Fine Watch Fine? (1947)

Thanks for posting this video, Mike. I had never seen it before. Couldn't help but think of what ever happened to those prototypes that never made it to production!