Bookman,
Ok, welcome to the wonderful world of S&W's numbering systems!
Ok, on your gun, the serial number is stamped on the butt - C221*** is the serial number. This means that your gun was made very likely in 1952.
The numbers stamped on the frame and crane, and a few other places, are assembly numbers. These are numbers used only on the assembly floor to keep parts to a specific gun together, normally during final polishing prior to bluing.
------------------
Beware the man with the S&W .357 Mag.
Chances are he knows how to use it.