Welcome, the Old Town canoe with serial number 162517 is an 18 foot long, CS (common sense or middle) grade, Guide model with a keel. It was built between October, 1954 and June, 1955. The original exterior paint color was G. S. (Guide's Special) green. It shipped on June 20th, 1955 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. Good luck with the restoration,