50-200 US Dollars
The stainless 2206 is worth about $285 in good condition. It is more sought after than the blued model 422 or the alloy 622.
YOu will have to call the factory to find out
50-150 USD or so
S&W can tell you when it left the factory if you call them.
As of 7/26/09 I gave $400.00, which is at least $100.00 to much. This was for a stainless/alloy model with one magazine WITHOUT the box or papers.
You will have to call S&W to find out.
Best left to a gunsmith if you don't have a manual. You can download one or request one via mail at the S&W website.