Last known boat title was from 1975 identifying it as a 1947 Old Town canoe. Problem is, relatives hint that it's older than that. Old photos shown the canoe in use prior to 1947. The canoe's overall length is 17 ft. 6 in. Numbers stamped fore and aft are 770 17. In using Old Town canoe's registry, the design and serial numbers don't qualify this as one of theirs? Any help is appreciated.