These seats are interesting, at least to me.
I had a early 30's ONS, I believe it was all (or mostly) original, and the seats looked nothing like those.
Both were hand cained, and one had an odd construction with diagonal splines holding the frame together.
(When I "freshened" it up, the only pieces of wood I replaced was 2 seat frame stretchers, and only then because 1 was missing.)
Unfortunately, I no longer have the canoe and/or have any pics of the seats.
Dan
Note, this is the only canoe I regret selling, and I tried to get it back but was not successful.
This canoe also had a large oval decal that I've never seen any other of, though I have heard of it's existence from others.