Old Town 157590 is a 17 foot CS (common sense or middle grade) Otca model canoe finished from April-August of 1952. It has a keel, outside stems, and a floor rack and was originally painted bright red. It was shipped to Nash Marine Supplies in Washington, DC on August 4, 1952.
The scan of this record is attached below-- click on it to get a larger image. 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 and anyone else reading this will join or renew membership in the WCHA so that services like this can continue. See http://www.wcha.org/wcha/ to learn more about the WCHA and http://www.wcha.org/join.php to renew.
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.
Benson would have a more definitive answer to your planking-question than I do. In general, the build records from the 50s onward aren't as fully filled-out as the earlier ones. My guess is that they used whatever cedar was available and simply stopped noting what it was they were using.
Yes, I've logged that Morris on eBay into our database... thanks to all who noticed and gave me a wave.
No, the 1952 catalog page below specifies that the standard planking was red cedar. White Maine cedar would be unusual and typically specified on the build record if it was used on your canoe. The messages at http://forums.wcha.org/showthread.php?t=809 give some links to examples of this.