I have rebuilt these with o-rings from the hardware store and they work great.
Try a large well stocked air gun shop.
Call S&W and they will tell you.
Compare it to known examples.
Contact S&W
Standard Catalog of Smith and Wesoon by Supica and Nahas
Standard Catalog of Smith and Wesson, 3rd ed.
Check the auction sites.
You must call S&W to find out.
You must call S&W to find out.
You need to find a firearms instructor.
Recommend you find a good gunsmith.
No