That is quite unusual to have an original bill of sale for an 89 year old car. Hawley is a small town of about 2000 in northern Minnesota. It may have been a little larger in the model A days. Many small towns in the Midwest USA have been shrinking, as farming is being reduced to much larger farms, with fewer farmers, thus shrinking towns. How the roadster got to France is probably a mystery. Maybe you know how it happened.
I am attaching some pictures I have of roadster seats. I have a 28 roadster, but I have not got to restoring it yet. It is in rough condition. I need to finish restoring my 29 phaeton and 29 CCPU first. I am not sure the red roadster seatback wood frame is exactly like original, as it is from a hotrod friend, but it will give you an idea of how the frame for the seatback is constructed. I might have a few more picture if you need them. My email is
[email protected]. Good luck with your seat work.
Rusty Nelson