Hello Jeremy--
Old Town 74976 is an 18' CS (common sense, or middle) grade canoe that was originally an HW but that has been crossed out on the record and I believe "CR" for Charles River has replaced it. Maybe someone else has a different interpretation of those chicken scratches... but the second letter seems to be an "R", so Charles River is my interpretation. The Charles River and the HW both had the same style deck and both came in the 18' length.
The canoe has Western red cedar planking, open spruce gunwales, birch decks, thwarts, and seat frames and was originally dark red. It was shipped with two back rests, slatted-style, in the special double width, and two single paddles, in spruce and maple, with 4" (I think) blades-- maybe a different width-- 7"? Do you still have them? The scan of this record is attached below-- click on it to get a larger image.
This scan and several hundred thousand others were created with substantial grants from the Wooden Canoe Heritage Association (WCHA) and others. A description of the project to preserve these records is available at
http://www.wcha.org/ot_records/ if you want more details. I hope that you and anyone else reading this will join or renew membership in the WCHA so that services like this can continue. See
http://www.wcha.org/wcha/ to learn more about the WCHA and
http://www.wcha.org/join.php to renew.
It is also possible that you could have another number or manufacturer if this description doesn't match your canoe. Feel free to reply here if you have any other questions.
It's very special to have a family canoe--- an honor to restore one that was paddled by generations of your family, knowing that your own kids may carry on the tradition.
Kathy