Fitz: The Old Town canoe with serial number 166893 is a 16 foot, OTCA model with a keel. It was built between December 1957 and April, 1958. The original exterior color was bright red. It shipped on August 5, 1958 to Auburn, Maine. A scan of this build record can be found by following the link at the thumbnail image attached below.
These scans and several hundred thousand others 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 hope that you will renew your membership to the WCHA so that services like this can continue. See http://www.wcha.org/wcha/ to learn more about the WCHA and http://www.wcha.org/join.php to renew.
It is also possible that you could have another number or manufacturer if this description doesn't match your boat. Feel free to reply here if you have any other questions.