My guess is that you probably have the Kennebec model that was considered 15 feet long since the Kineo special model with this number had sponsons like the ones shown at
http://forums.wcha.org/showthread.php?t=3995 in Kathy's pictures.
The Kennebec canoe with serial number 3139 is shown on pages 102 and 103 of volume one in the Kennebec ledgers. This was assigned to an 15 foot long Kennebec model with spruce rails, ash stems, and cedar planking. It was planked by Adams(?) on January 22nd, 1910. It had 15 inch "a" decks which could be model A or ash. The 54 inch wide, number 10 canvas covering was applied by Phillips on January 29th, 1910. The first filler coat was applied by Blake on February 10th, 1910. The keel, braces (thwarts), and seats were "m" (mahogany?). It was railed by Knowlton(?) on October 8th, 1910. The original color was "B" (bright?) green. It was painted by Smith(?) on July 19, 1913. It was shipped to Gould on July 24th, 1913.
The scans of these build records can be found by following the links at the attached thumbnail images below. These original Kennebec records are reproduced through the courtesy of the Maine State Museum.
The microfilms and scans of these records were created with substantial grants from the Wooden Canoe Heritage Association (WCHA) as you probably know well. 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/wcha/ to learn more about the WCHA and
http://www.wcha.org/join.php to renew.
More information about this and other Kennebec models can be found in the Kennebec catalogs contained on the Historic Wood Canoe and Boat Company Catalog Collection CDs available from
http://www.wcha.org/catalog/ and
http://www.dragonflycanoe.com/cdrom.htm on the web.
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.
Benson
