Hello Ed, Your HIN should be on the starboard side of your transom near the top. It is often hard or impossible to see on older boats as they often get painted over. Just FYI… it’s 12 characters. Yours will begin with SYX (the MIC code for Starboard Yacht co). If Starboard Yachts incorporated the hull number into its HIN, it would be part of the middle 5 characters. The final 4 characters will be the build date.