If it runs I'd buy it for $50 Looks like a smaller unit, twin cylinder, single stage, probably ~8-10CFM @ 90psi. ~120psi max pressure. Maybe a 40gal tank, but that is just a WAG.
seller says it works fine i dont know much about compressors would would be somethings id be looking for im just a at home diy kinda guy so no heavy use
Yea, if it truly runs fine, for $50 you really can't go wrong. I'd just check the oil level and tank water drain. Those would indicate that the PO did or did not take care of it. Hope it works out well for you