The Old Town canoe with serial number 172698 is a 17 foot long Otca model with a keel. It was built between December, 1962 and February 1963. The original exterior paint color was dark green. It was shipped on July 30th, 1963 to Whitehall, New York. A scan showing this build record can be found below.
The scanned records stop around 250,000 so nothing is available for serial number 773939. Please attach a picture of this number if you aren't sure about any of the leading digits. It should have a hull identification number on the starboard stern which ends with a two digit model year if that helps.
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 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.