Could you post a little more information about it - model, serial number or a photo? Generaly I would say make sure it is complete and has been stored indoors. Exterior condition tells a lot about how it was cared for. Expect that it will need at a minimum a good cleaning and lubrication. Check with motor and controller wiring. Odds are that if the wiring is original, it should be rewired. The old insulation deteriorates and cold cause an electrical safety hazard.