I agree with loz. It does look very marshan 21 like. Especially with the steep angle of the hull from the rub rail into the underside. And the top deck from the rub rail in has the same angle and width as the 21 deck also. I know the 19's were very rounded at the front part of the hull but cant remember wot the 21's were like?
Class 3C Mono EPA National speed record holder 95.35 mph Avg!