The Old Town canoe with serial number 209451. This is an 18 foot long Chipewyan model with aluminum inserts in the vinyl rails. It was built between August and September, 1975. The original exterior color was red. It shipped on December 31st, 1975 to Spokane, Washington. The back side of this card shows that there were some scuffs and light stains inside the hull. Scans of both sides of this build record can be found by following the links at the attached thumbnail images below.
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 will join or renew your membership to the WCHA so that services like this can continue. See http://www.wcha.org/about-the-wcha/ to learn more about the WCHA and http://store.wcha.org/WCHA-New-Membership.html to join.
It is also possible that you could have another number or manufacturer if this description doesn't match your canoe. This model was later identified as the Voyageur model in the 1978 catalog. Feel free to reply here if you have any other questions.