I've attached pictures of two Robertson stems. The stems are from a short deck and a long deck canoe. The short deck canoe has no metal tag, but Robertson is stamped into the top of the thwart near the rails. The long deck has a metal Robertson tag.
Yep, Canoeal, I posted the pictures as examples of Robertson stems that I know about. They are pretty much square in profile, but the edges are beveled or eased.
After going through the picture and a whole mess of paper, I found the two canoes with rounded stems. One was an early Racine model B 68, the other appears to be a Racine Seneca Model. Thanks for all the suggestions.
Al Bratton