owasco

I am removing the original canvas from a Penn Yan Owasco. As usual, there are two tacks holding the canvas at every rib. But then halfway between each rib there is a much shorter tack that only goes through the planking and appears to be clinched. The photo shows examples of the longer tacks...

Does anyone have any resources they can recommend to help me identify the original paint colors/pattern on Penn Yan canoes built between 1948 and the early 1960s? I've searched the forum, and the WCHA store without luck. Any catalog examples, photos, or book recommendations would be greatly...