Although I’m not 100% sure what it is, I’m fairly certain I know what it isn’t. The lack of any bow decal, name-plate, and without any striping on the side of the hull, it’s more difficult to identify. I'm assuming it was removed by the owner. It also appears he painted the hull.
It’s most likely not a Sawyer Canadian. Reason being, the sheerline and the curvature of the bow below the waterline is not that of the Sawyer Canadian. Also, if the 16’ length listed in the ad is correct, it is 6” too short to be the Canadian.
Furthermore, the Sawyer line had the seats mounted on crossbars, which were mounted on brackets and then riveted to the side of the hulls, which is why I’m ruling out the Sawyer Sport. The ‘economy’ line of the Sawyer Canoe Company, (with the moniker Oscoda, AuSable, or even the Rebel line), had the seats riveted and hung from the inside of the gunnels like the canoe in the ad.
Additionally, in the early 80’s Sawyer dropped the AuSable moniker and renamed the ‘economy’ line ‘Oscoda’. The Sawyer line almost always had the crossed paddles logo on the bow of the Sawyer line of canoes until late 1984.
It’s most likely a 16' Oscoda Pleasure; formerly the AuSable Sport 16. (It was renamed an Oscoda Sport 16 a few years later.) If you look at the 1981 price list I’ve posted below, you’ll see the 16’ Pleasure listed under the Oscoda heading. The lay-up also appears to be the ‘economy’ lay-up as well.
Hope this helps.
Hans Solo