Welcome and congratulations, the Old Town canoe with serial number 81366 is a 17 foot long, CS (Common Sense or middle) grade, HW (heavy water) model with red Western cedar planking, open spruce gunwales, birch decks, birch thwarts, birch seats, and a keel. It was built between October, 1923 and January, 1924. The original exterior paint color was dark green. It shipped on April 30th, 1924 to Philadelphia, Pennsylvania. A scan showing this build record can be found by following the link at the attached thumbnail image below.
This scan and several hundred thousand more 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 will donate, join, or renew your membership to the WCHA so that services like this can continue. See
https://www.woodencanoe.org/about to learn more about the WCHA and
https://www.woodencanoe.org/shop to donate or join.
It is also possible that you could have another number or manufacturer if this description doesn't match your canoe. Canoes with a family connection are always extra special. The information at
https://www.wcha.org/forums/index.php?threads/10440/ should help with the tips. Feel free to reply here if you have any other questions. Good luck,
Benson