Dave:
OT 125642 - 15 would appear to be a 15' Square End paddling canoe of CS grade with open spruce gunwales, ash decks and thwarts, and possibly both ash and spruce seats. It was equipped with a rowing seat, along with half ribs, OSS,and keel. Originally painted dark green and shipped to Kelley-How-Thomson, of Duluth, MN, on 14 April 1939. The scan of the build record is below.
Hope this helps.
Roger