Your canoe is an 18 foot CS (Common Sense or Middle Grade) OTCA Model with western red cedar planking, open spruce gunwales, half ribs and a keel. It was built in 1948, painted dark green, and sold to a lady in West Yarmouth, MA.
This scan and several hundred thousand others 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/ot_records/ if you want more details. I hope that you will join or renew your membership to the WCHA so that services like this can continue. See http://www.wcha.org/about-the-wcha/ to learn more about the WCHA andhttp://store.wcha.org/WCHA-New-Membership.html to join.
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.
The sail rig is not included on the invoice. Was that typically added later by the owner? Is there a reference you can point me to that shows how the sailing equipment should be set up?
Many owners purchased sailing rigs after buying the canoes. When thinking back over serial number searches of canoes with sailing rigs, I'd venture that more than half had sailing rigs that were not original to the canoe.