Wow, you got a great one at an excellent price. $750 would be a reasonable price for an old one in rougher condition, but this is an outstanding canoe from what I can see in photos. Teens-era Otcas were well built and this one is at the very top with its mahogany trim and outside stems. In this model and era, Old Town really paid attention to the details - beautifully chamfered rails and those gunwales that transition from open to closed at the ends (and more). And on top of all this, the canoe is exceptionally fine condition for its age! Great canoe!
By the way, it LOOKS like canvas to me, but maybe in person it's more obviously 'glass. Hope not but if it is, it can be reversed.