Welcome, the Old Town canoe with serial number 223037 is a 17 foot long Chipewyan Tripper model with aluminum inserts in the rails that weighed 74 pounds. It was built in October, 1978. The original exterior color was green. It shipped on December 15th, 1978 to Spokane, Washington. A scan of 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 join.
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.
This is an acrylonitrile butadiene styrene (or ABS) plastic. The page at the link below has more details about this material. Uniroyal called it Royalex and Old Town called it Oltonar. The pages from the 1978 catalog below have more details. Let me know if this doesn't answer your question.