ive got a mongomery ward sea king. kind of hard to compare with that pic, but its a good boat. a little flimsy (thinner alum) but it does just fine and I beat the crap out of it
I'm with Ahab. You aren't going to want the headache of a fiberglass boat of that age when aluminum boats will fit your purpose just fine. From the picture, I am 100% certain it is glass. Were it me in your shoes, I'd keep looking.