Hi Chris--
I'll attach a picture of our "late" Gerrish, which has a carry thwart but a different deck and open gunwales. We assume it's one of his later canoes because of the open wales and lack of lashings. Our canoe has one original seat, different from your canoe's but like other Gerrish seats with the wire side pieces. Our other Gerrish-esque canoe (not a confirmed Gerrish) has a seat with four wooden elements, as with your canoe, but without any holes-- the reed is all wrapped around.
Are there any two Gerrish canoes that are alike?
The stenciling on the planking of our confirmed-Gerrish says E. H. Gerrish >builder< Bangor, ME. Would be interesting to know how many others are stenciled in this manner... and if it's a "late Gerrish thing".
Kathy