on the plus side:
-Baldor is a respected motor name
-the mill looks fairly clean
-all three handles are present
-there is a vise of some type
-the belt looks almost new
a couple things could ding you on the price:
-the motor capacitors hanging out and electrical box missing the cover
-the insulation that I assume is from the ceiling; hopefully the mill is not in danger of being dripped on!
Other accessories could also boost the price if in good condition:
-boring head
-end mills
-table t-nut clamp set
If you are going to have it under power for inspection be sure to lubricate first!
I will refrain on an estimate, my dollar and equipment market are completely different!
-brino