Hi Lou--
Check the numbers again, on both stems. I looked up 141545 17 and it was a 20 foot guide model. The Old Town serial numbers on CD are up to six digits long, followed by a space and the length of the canoe.
If you have trouble reading the numbers, sometimes digital photography brings them out and if you post the picture, many eyes can work on it. Pictures, in general, can help a lot... and give us a chance to see what you found!
Kathy