Pete Thompson's son Jerry has an open lapstrake Sea Mate from circa 1963. Just an open boat - no deck or seat backs, etc... It was displayed at the Thompson Boat Rally a few years ago. Pete said it was an unfinsihed hull that sat in a corner of the factory. One day he decided to turn it into an open fishing boat.
For a year or two only, Thompson offered the lapstrake boats with clinch nail fastening lieu of bolts/nuts. So..."Thompson Quality" was the bolted hull planking while "Regular Quality" was clinch nailed. Lyman's were clinh nailed.
I have NEVER seen nor heard of a lapstrake Thompson that is clinch nailed. So, I have concluded that virtually no one bought them that way.
Cruisers, Inc. had an order from Montgomery Wards circa 1956 to make 300? boats for the retailer. Those were clinch nailed, not bolted.
Looking at the Model 1773 reminds of mine. I think mine must be the 1750 model, it has back to back seats except the front is a full bench. Even the color is the same. I can remeber the the models from the 50's. It reminds me fishing with my dad in northern Minnesota when I was a kid. Thanks for posting the pics.