Welcome and congratulations, the Old Town canoe with serial number 177168 is a 16 foot long Guide model with a keel. It was built between November, 1966 and February, 1967. The original exterior paint color was G. S. (Guide's Special) green. It shipped on April 14th, 1967 to Grand Rapids, Michigan. A scan showing this build record can be found below.
This scan 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/catalogs/old-town/records/ if you want more details. I hope that you will donate, join or renew your membership to the WCHA so that services like this can continue. See https://www.woodencanoe.org/about to learn more about the WCHA and https://www.woodencanoe.org/shop to donate or renew.
It is also possible that you could have another number or manufacturer if this description doesn't match the canoe. Feel free to reply here if you have any other questions.