The Old Town canoe with serial number 175835 is an 18 foot long, Guide model that was built on the Otca form with a keel. It was built between March, 1966 and January, 1967. The exterior paint color was G. S. (Guide's Special) green. It shipped on May 3rd, 1967 to Bound Brook, New Jersey. 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 as you probably know well. 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 http://www.wcha.org/about-wcha
to learn more about the WCHA and http://www.wcha.org/store/membership
It is also possible that you could have another number or manufacturer if this description doesn't match your canoe. Feel free to reply here if you have any other questions.