JH,
As you can see, there are lots of folks here that are willing to assist. A few photos and a couple of measurements will go a long way towards getting your canoe identified. To move this along, let us know if this constructed entirely from wood or if it is wood and canvas. Then, a few photos of the decks, seats, thwarts and the profile of the canoe will help identify it. As was noted by Kathryn, the SN is not going to be very useful in dating the canoe. But not to worry, there are other distinguishing features that will help to pin it down. For example, is Rushton stamped into the bottom side of the thwarts?
For historical interest I suggest that you buy Atwood's book.
http://www.amazon.com/Rushton-His-Times-American-Canoeing/dp/0815601417
It contains a great deal of information that will help you to understand and appreciate your canoe. There are folks that will take issue with the details of his mechanical drawings... not to worry; they will help you to identify a Rushton. This book was Atwood's passion. He obsessed over the history and did collect a great deal of very interesting information for us to enjoy.
You should also look at buying the catalog re-prints available here on this site at the Online Store. You will likely find your canoe in one of these.
http://woodencanoe.org/catalog/prod...d=397&osCsid=d90dff86b5abd1cc287668935f67d0bf
http://woodencanoe.org/catalog/prod...d=425&osCsid=d90dff86b5abd1cc287668935f67d0bf
If you are in the area, the Clayton Boat Museum and the Blue Mountain Lake Museum have some of these canoes on display. Both museums are worth a visit (if not several).
Good luck with your canoe and enjoy it. These are among the most desirable old canoes around. Don't sell it before you know exactly what it is.
Out of curiosity, why do you think that the canoe is a Rushton?