The Old Town canoe with serial number 164940 is a 17 foot long, AA (or top) grade, Otca model with a keel, a floor rack, rub rails, and a rudder. It was built between February and June, 1956. The original exterior paint color was similar to the one shown at
http://www.wcha.org/catalogs/old-town/designs/design45.gif which was known as the design number 45 with the name Scotch Point in 2.5 inch blue block letters on the right and left bow. It shipped on June 15th, 1956 to Chicago, Illinois. A scan of this build record can be found by following the link at the thumbnail image attached below.
This scan and several hundred thousand more were created with substantial grants from the Wooden Canoe Heritage Association (WCHA) and others as you probably know well. A description of the project to preserve these records is available at
http://www.wcha.org/ot_records/ if you want more details. I appreciate your joining as a life member to the WCHA so that services like this can continue.
It is also possible that you could have another number or manufacturer if this description doesn't match your canoe. Please attach some pictures if the original design is still showing. Feel free to reply here if you have any other questions.
Benson