JPG wrote:The headstock motor has been the same since the early 60's Mark 5.
The headstock vintage matters not. A later version is a plus.
The '500' is the same as a late Mark 5.
There is a '500' rip fence upgrade that includes the top t-slot.
A 505 is the same as a 510 but without the floating tables and connecting tubes etc..
The miter gauge pistol grip goes all the way back to the 50's.
Pix would help! I think you have a Mark V 500 with an upgraded rip fence and a newer headstock. If it is indeed a "C" (red switch) headstock, it should also have the two bearing quill.
Thanks you for the info. Very useful. I'm deciding against buying this as I would rather have a unit with the upgraded model 510 table and the seller is asking too much considering my future added cost to upgrade the table system. I should have taken pictures but at the time didn't think of it.
Thanks to everyone here for their advice and assistance!