The Old Town canoe with serial number 7741 is a 17 foot long, AA (or top) grade, Charles River model with red western cedar planking, open mahogany gunwales, mahogany decks, mahogany thwarts, mahogany seats, half ribs, an extra long keel, a tapered gunwale, and a floor rack. It was built between November, 1907 and April, 1908. The original exterior paint color was N. H. (New Haven) green. It was shipped on April 7th, 1908 to Schenectady, New York. A scan of this build record can be found by following the link at the thumbnail image attached below.
This scan and several hundred thousand others were created with substantial grants from the Wooden Canoe Heritage Association (WCHA) and others. A description of the project to preserve these records is available at
http://www.wcha.org/ot_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-the-wcha/ to learn more about the WCHA and
http://store.wcha.org/WCHA-New-Membership.html to join.
It is possible that you could have another number or manufacturer if this description doesn't match your canoe. The Old Town with number 187741 is a 14 foot long fiberglass canoe from 1972 and the Carleton with this serial number is a 16 foot long canoe that shipped in 1910. There is no record of a Kennebec with this serial number. Some pictures of the numbers from each end and the nameplate on the bow deck of your canoe could help. The information at
http://forums.wcha.org/showthread.php?791 may also be useful. An Old Town canoe from the 1920s is likely to have a high five digit long serial number as the chart at
http://forums.wcha.org/attachment.php?attachmentid=24293&d=1360203686 shows. Feel free to reply here if you have any other questions.
Benson