[Ron Ramirez]

I've seen one other besides yours, Bruce, and am aware of a third owned by the gentleman who furnished a photo of it for this site's Gallery. Plus a fourth, the chassis of which I restored a year or two ago. That one had to have a new Heyboer power transformer made for it.

There are some others out there, but just how many, I do not know.

Incidentally, I've never owned a 680. But since I did get to work on one once, I can appreciate what really great sets they are.