If its in good condition $250 is not bad, If you can open it up and check out the
inside (unlikely though) and the board and electronics look clean I would jump
on it.
Check the push pads for exessive wear and tear, check the coil for cracks
especially where it mounts to the rod (ears) and check the wire for dry rot. Look in the
battery compartment and make sure its clean with no white powder substance
indicating a past battery leak and you should see some of the board through
the battery compartment.
You do know thats a gold only machine right?