Hi Tad - This is a tough one. Your canoe appears to have been significantly modified since it was built. It looks like the inwales may have been cut down and new decks installed along with the added Old Town plate. The only full canoe photo is pretty low-resolution but it appears that the seats are replacements or significantly altered, and the thwart is covered with something so it's shape can't be seem to possibly provide a clue. If you know the canoe's history (who owned it previously), perhaps you can find some images from before it was altered. That might really help. With what we have here, there just don't seem to be enough details to make a reasonable guess.
Wish I had better news,
Michael