The Old Town canoe with serial number 171675 is a 15 foot long fifty pound model with a keel. It was built between December, 1961 and February, 1962. The original exterior paint color was dark green. It shipped on April 9th, 1962 to North Brunswick, New Jersey. The back side of the card shows that there was a previous request for a copy of this build record in February, 1971 from Princeton, New Jersey. Scans showing both sides of this build record can be found below.
These scans 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 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. Feel free to reply here if you have any other questions.