Or possibly a "Rare Vintage Caned Wood Folding Canoe Seat by Essex Industries" (too funny) at a bargain price.
You have to wonder who would have paid more than the original asking price to buy one from Ebay? Folding Canoe Seat (essexindustries.org)
Here are two pictures of a folding seat that I have. No builders tag so don't know the manufacturer. The seat measures 12" wide and 15" front to back. It is 21.5" tall overall. There is a 5/8" dia. dowel through both legs and the uprights under the seat so the back will fold forward. It has a nice "S" curve to the back which makes it a little nicer than the new ones available. I currently have this seat disassembled so I can refinish it and re-cane it. It's mahogany. It's not a very big so if you want a bigger one just scale up the dimensions. I could take additional photos and dimensions if you want.