It's interesting to note this gun was made in May of 2001 during the brief time frame when S&W decided to inscribe the s/n on the frame below the cylinder window on certain models. It will likely NOT have a s/n on the bottom of the grip frame, which was the traditional s/n location for S&W's since time immemorial. In 2002 S&W abandoned this practice and went back to the old way of inscribing the s/n on the bottom of the grip frame.
This was one of the last N-frames to be built without the lock. By the mid 2002 they all had it. I'll agree with Dale and say $800 to $900 retail.