The capacity plates using the boating industry standards gave load capacity and equivalent persons capacity based on a nominal weight per passenger. Didn't mean there were seats for 4 or if it would paddle well with 4. If two of the four laid flat on the floor of the canoe it might work.
The best guess for l985 at 17' with a Sawyer label would be the X-17. One of the 3 Yost designed tandems of that era for Sawyer. Good designs, with somewhat inconsistent build quality.
More measurements would be helpful. Depth at bow, stern, and center. Width at gunwales and maximum hull width. And a photo.
Heel and Pegpads™
Reflective Hull Decals
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