My guess is that you have the Old Town canoe with serial number 161261. This is a 16 foot long, CS (common sense or middle) grade, Otca model with a keel. It was built between December, 1953 and January, 1954. The original exterior paint color was dark green. It shipped on April 30th, 1954 to Hudson, New Hampshire.
The only other 16 foot long canoe in the 16126x range is number 161262. This is CS (common sense or middle) grade, Otca model with short 16 inch decks, a keel, and sponsons. It was built between December, 1953 and February, 1954. The original exterior paint color was Old Town yellow. It shipped on April 27th, 1954 to Pompton Plains, New Jersey. It seems less likely to be this one since there don't appear to be any screw holes along the sides from the missing sponsons in your pictures. The current decks, thwart, and rails are not original.
Scans of these build records can be found by following the links at the attached thumbnail images below. These scans 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
It is also possible that you could have another number or manufacturer if this description don't match your canoe. Feel free to reply here if you have any other questions. Good luck with the restoration,