Looks like a 1974 hull and a 1973 interior. We will have to wait till the "experts"
(Jason and Gregg) pipe in.
For a little more investigating, if you are able to crawl on the floor and look behind the dash where the passenger normally sits. On the face board back there under resin there is possibly a build date. This is a cramped little hole of a place to get your body into. I'm betting it was built in Jan or Feb of 1974 and they just carried the nice blue interior over to this 1974 model.
Here is mine, and what you are looking for. the other numbers will probably match your hull numbers.
Yup, put it in the water. Anybody can have a new one, you've got something special.