Looks like the housing is rough shape. Lots of rust. But it looks to be a good unit,tag information is good. You can wire it for single or three phase.If it has a voltage selector switch. I would check it over real good. Switching when running can burn out the switch. Which means lots of money to replace.
Have them run it for you. Should be a very quite. Would make a good standby for a house or barn.I wouldn't offer more than 2000.00.If that much.