The Old Town canoe with serial number 123659 is a 16 foot long, CS (Common Sense or middle) grade, HW (heavy water) model with open spruce gunwales, a keel, and outside stems. It was built between November, 1937 and May, 1938. The original exterior paint color was dark green. It shipped on June 20th, 1939 to Ashland, New Hampshire. 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 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. The information at http://forums.wcha.org/showthread.php?57 may help if you want to sell it. Feel free to reply here if you have any other questions. Good luck with the decision,