I've looked at the available 117x58, 117x68, 177158, and 177168 records but didn't find a 16 foot long square stern in AA grade with sponsons. This model was last listed in the 1964 catalog so it isn't likely to have a serial number in the 177xxx range since these were issued in 1966 and after. The rubbing as MGC suggested an other tricks described at
http://www.wcha.org/forums/index.php?threads/791/ may help.
Could it be the Old Town with serial number 117888? This is a 16 foot long, AA (or top) grade, square stern model with red western cedar planking, open mahogany gunwales, mahogany thwarts, mahogany seats, a keel, outside stems, a floor rack, and sponsons. It was built between May and July, 1936. The original exterior paint colors were dark green with tropical green and lettered "G. L. H." in four inch gold letters on the right and left bow. It shipped on July, 21st, 1936 to Portland, Maine. A scan showing this build record can be found by following the link at the attached thumbnail image 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 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 to renew.
Please post some pictures here showing the numbers from both ends. Feel free to reply here if you have any other questions.
Benson