if newer than '72, and made in USA, it'll have a hin one it. generally on the transom, upper starboard side (but not always, mine is in the middle of the transom, just above the drive. engraved into the fiberglass). the hin will lead ya to the mfg.
Guys, I think those are pix of the boat his dad HAD, which he'd like to figure out so he can maybe buy the same or extremely similar boat now. No looking for a HIN.....
Any chance your dad saved EVERYTHING and theres an old registration or insurance cert tucked away somewhere. You might get lucky and find info listed tha lt would help ID it, but those 2 pix arent enough
Good luck w your quest
Post any other pix you find. Might show enough for someone to recognize