The Old Town canoe with serial number 124840 is an 18 foot long, AA (or top) grade, Otca model with open mahogany gunwales, mahogany decks, mahogany thwarts, mahogany seats, a keel, outside stems, and floor rack. It was built between April, 1938 and July, 1939. The original exterior paint color was spruce green The initials S. A. K. were painted on the right and left sides of the bow. It shipped on July, 27th, 1939 to Wilsons Mills, Maine. 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
https://www.woodencanoe.org/pricing-plans/join to donate or renew.
It is also possible that you could have another number or manufacturer this description doesn't match the canoe. Feel free to reply if you have any other questions.
Benson