Re: First Glastron 19?? / Model ??
That's the tri-hull V145 Fireflite. Note the grab bars at the stern seats. They only made them (the boat model) for a couple of years around 1970. I had one and it was a piece of work--great little boat, but very rough riding in wakes and waves. I put full custom canvas on mine. It is the model that went into the swimming pool in James Bond "Live and Let Die."
It should have rolled and tucked cener arrow in the deck in the same color and material as the interior. It should also have two fake (decal) "vents" on each side of the deck arrow. Originally there was no stern seat, only two fold out lounges up front. It was rated for 60 Horsepower.
When I traded mine for a 15 foot V153, a couple of jerks stole a 100 Merc and hung it on the back. They were caught by police before the title transfer went through, so the cops showed up at my house thinking the boat was stolen too. I was on a cruise to Canada and it puzzled and scared my parents. I wish I still had that boat!
Edit: By the way, the windshield does not look stock. The original although a wrap-around, had "squared" raked back edges.