The Old Town canoe with serial number 151040 is a 18 foot long, CS (common sense or standard) grade Otca model with red western cedar planking, open spruce gunwales, and equipped with a keel and rub rails. It was built between May and December 1948. The original exterior paint was OT design #45. It was shipped to Johnson City, New York on June 9, 1950. Scans of this build record and of the paint design can be found by following the links behind the thumbnail images attached 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. Feel free to reply here if you have any other questions.