This patent describes a form of batten seam construction where the batten is hidden within the the seam between adjacent planks. It is not clear if this methods was actually used in production.
This image, from a glass plate negative, shows a couple of dapper young men in a wide-board canoe.
Tandem Paddle Champs. Frank Crick (left) andStanley Comokowski, of the Cacawa Canoe Club of Philadelphia, who repeated their 1938