-- Last Updated: Nov-12-12 10:09 AM EST --
The "SN" presumably means serial number and is not part of the hull identification number (HIN). The "XTC" is the manufacturer identification code assigned to Johnson Outdoors, which now owns Old Town Canoe. The canoe was built in 1989.
The 5 digits following XTC might identify the model number to an Old Town expert. I am not an Old Town expert but for what it is worth I am not familiar with an Old Town model called the Wilderness. Old Town made a number of models around 17 feet in length including the Tripper and Penobscot in Royalex, the Canadienne in composite, and a couple of Discoveries (169 and 174) in polyethylene.
You can try calling Johnson Outdoors at 800-343-1555 or 207-827-5514, or post pictures here if nobody can identify the model from the HIN.