The Old Town canoe with serial number 72587 is an 18 foot long, CS (common sense or middle) grade, HW (Heavy Water) model with red western cedar planking, open spruce gunwales, birch decks, birch thwarts, birch seats, a keel, and sponsons. It was built between June and July, 1922. The original exterior paint color was dark green. It shipped on July 13th, 1922 to South Rangeley, Maine.
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.
You may have another number or manufacturer if this description doesn't match your canoe. The space and the 17 at the end which you described is usually an indication of a 17 foot long canoe. The information at
http://forums.wcha.org/showthread.php?791 may help you discover if there are any missing or hidden digits. Can you verify the exact overall length between the extreme ends of the canoe and attach some pictures, especially ones showing the decks and all of the serial numbers on the inside stems from each end? I have checked the records for 72537, 172587, and 172537 but didn't find a 17 foot long canoe there either. Please feel free to reply here if you have any other questions.
Benson