No guessing involved. Call S&W and they will tell you when it left the factory. The Model 51 was made from 1960-1974.
open the cylinder, and it should be stamped there along with the serial number
Open the cylinder and look at the frame that is usually hidden by the crane. The serial number is stamped on the frame.
Check the butt.
1980
1980
1974
what is my 32 revolver woth
Realistically, you can't. If you give the sn, the best you will get is range of models. If it has a model number, it will be stamped on the revolver inside the frame by the yoke/crane assembly.
If you mean a Smith & Wesson Model 629-1 revolver, it is stamped on the bottom of the grip frame. It will be covered by the grips. A secondary SN is usually stamped on the frame under the cylinder crane. Open the cylinder to see it.
No
Read the one on the butt.
@1969