Numbers under the cylinder crane that aren't model numbers would be part of the serial number. There aren't any part numbers or assembly numbers on S&W revolvers. Take those rubber grips off and you would see the full serial number stamped on the bottom of the grip frame.
It's probably rare to find a M60 that has been run hard with mag ammo, just because most people can't tolerate much of it. The original M60's were in .38 special and had 2" skinny barrels with exposed ejection rod. They were one of the first mass produced handguns in stainless steel, and were usually known as the "Chief's Special".
It's probably rare to find a M60 that has been run hard with mag ammo, just because most people can't tolerate much of it. The original M60's were in .38 special and had 2" skinny barrels with exposed ejection rod. They were one of the first mass produced handguns in stainless steel, and were usually known as the "Chief's Special".