The Old Town canoe with serial number 208686 is a 17 foot long Molitor model with a keel. It was built between July, 1975 and March, 1976. The original exterior paint color was green with a white rim stripe. It shipped on March 31st, 1976 to Shrewsbury, Mass. A scan of 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 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. Can you supply any pictures? Feel free to reply here if you have any other questions. Good luck with the restoration,