I'm sure other Beaudry heads will chime in.
Bring a LED flashlight look inside the ram and check if the rollers have frozen and worn groves on the interior of the ram.
Check the frame around the anvil hole for cracks.
Check the frame ram guides for scoring/ impact damage from the die key.
Check the frame between the ram guides for cracks from running the guides loose.
I'd say $1000 for a hammer that needs machine work on the sow block (new dies?) motor, magnetic starter, slip belting, jack shaft and stand. A clutch model might increase it's value, a busted sow block would decrease it. I'd say the value of a 100lb Beaudry, LG, Bradley with all the work done by your average person is the about the same, around $4000.