IF it's an Old Town (and it may or may not be), that's a really low (early) serial number. I'm not sure if the scanned recoreds that people have go back into 4-digit land. Take a close look in good light, and with side-lighting, make sure there are no more digits in front of the 3... Check both stems, as the SN may be easier to read on one end than the other. The older the canoe is, the harder it is to read the SN...