Originally Posted by tubbo
Looks a bit like a Prijion 420 or Special Slalom popular in the 70's, early 80's. There was a commercial builder (Hyperform) licensed to build the German designs here in the states in fiberglass. If the boat is length is over 13'6" it might be a 420, if it's 13'2" it might be a Special Slalom. Look for a serial number etched near the stern. If it's HPP or HIP it might be one of their boats. Any spray skirt for a standard sized cockpit should fit. Good luck.
It's 10'-9" and I think the ser. number may be under some bodywork, or it doesn't have one.