Heh...412 hrs...what year? I bought mine with 1091 hrs...all original except for scheduled maintenance (manifolds/risers/etc.). The guy took great care of it. I've put another 40hrs on the meter since I bought it 6 mos ago. There were a few things it needed that were obvious upon purchase, and another issue that wouldn't have been discovered even with a survey.
Get it looked at by a professional and see what receipts/service records show.