IF your canoe is an Old Town --
The Old Town canoe with serial number 51275is 16 feet long, CS (common sense) grade, HW model with western cedar planking, spruce , birch seats, decks and thwarts, and a keel. It was built between January and August, 1918. The original exterior paint color was some sort of Green (dark??). It was shipped on March 20, 1909 to Houston, Texas.
A scan of this build record can be found by following the link behind the thumbnail image 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. If that is the case, photographs of the deck, side profile, seats, and other details would be helpful in identifying the canoe. Feel free to reply here if you have any other questions.
Greg