Depends on the guides and ways, the slop in the bearing ... etc you just have to go through and check quite a bit of stuff.
Chevalier brand is a Taiwan knock off of a Bridge port, depending on its condition can be a decent machine. This thing by the looks of it does not have the x or y servo motors, If every thing is actually working my guess to me 1500-2k but I bet they might want more. Lots of mills like these in the 3-4k range that are a lot more together than this thing. FYI figure 12-1500 lbs.