I would say imposable to say from the pics.
- Does it have an hour-meter?
- Does it start?
- Does it run?
- Does it smoke
- Does it produce a steady voltage?
- Does it maintain steady frequency?
- Have you pulled a valve cover off to look for signs of sludge indicating poor maintenance?
- Checked the coolant condition?
- Has the factory wiring been all hacked up or does it look original?
If all of the above looked good I would want to run it with 80% to 100% load for about an hour to verify it was in good working order.