The Old Town canoe with serial number 78145 is an 18 foot long, AA (or top) grade, HW (Heavy Water) model with red Western cedar planking, open mahogany gunwales, mahogany decks, mahogany thwarts, mahogany seats, half ribs, a keel, outside stems, and sponsons. (The date stamps didn't scan well so I guessed on some of these.) It was built between April and June, 1923. The original exterior paint color was dark green. This shipped on June 9th, 1923 to Rockville, Connecticut. 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 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
http://www.wcha.org/about-wcha to learn more about the WCHA and
http://www.wcha.org/store/membership to join.
It is also possible that you could have another number or manufacturer if this description doesn't match your canoe. The sail rig was not mentioned so that was probably added after it left the factory. Feel free to reply here if you have any other questions,
Benson