Tom, are we talking about the same canoe?
The one I sold them we (Dan M and I) thought was a Thompson, and had all the features of a T.
The canoe I sold them was bought by my BIL from a co-worker many years ago at her garage sale in south MPLS for $25. During his ownership of it, at one point, he had it stored outside under the eves with a small sailboat on it, resulting a lot of "hog". I tried to get some of it out with some boards/braces pushing it down/out, and wetting it ever so often, but it was still there when it was sold.
Oh, the canoe we had, had a S/N stamped in a rib just behind the ft stem, "1030 16", large letters, perpendicular to the length of the canoe.
No SN in the rear of the canoe.