The Smith and Wesson Model 64 Military and Police revolver is the stainless steel

Stainless steel

In metallurgy, stainless steel, also known as inox steel or inox from French "inoxydable", is defined as a steel alloy with a minimum of 10.5 or 11% chromium content by mass....

 version of its Model 10. It is a six shot revolver chambered in .38 Special

.38 Special

The .38 Smith & Wesson Special is a rimmed, centerfire cartridge designed by Smith & Wesson. It is most commonly used in revolvers, although some semi-automatic pistols and carbines also use this round...

.

The Model 65, is similar but chambered in .357 Magnum

.357 Magnum

The .357 S&W Magnum , or simply .357 Magnum, is a revolver cartridge created by Elmer Keith, Phillip B. Sharpe, Colonel D. B. Wesson of firearms manufacturer Smith & Wesson, and Winchester. It is based upon Smith & Wesson's earlier .38 Special cartridge. The .357 Magnum cartridge was introduced in...

, being a stainless steel version of the carbon steel Model 13

Smith & Wesson Model 13

The Smith & Wesson Model 13 is a .357 Magnum revolver designed for military and police use. It is based on S&W's K-frame platform—specifically, it is a .357 Magnum version of the heavy-barrel variant of the .38 Special Model 10 .This is a double action revolver with a capacity of six rounds...

. The Model 65 cylinder is longer to accommodate the longer .357 Magnum cartridge. The Model 65 was in production from 1972 until some time in 2004-2005, and utilized the same standard K-frame (S&W medium frame) as the Model 64. Beginning in 1980, S&W also produced .357 Magnum revolvers on their "medium-large" frame size ("L-frame") to better handle the higher long-term stresses of the magnum loads, calling the larger frame revolver in stainless steel the Model 686.
Specifications

• Caliber: .38 S&W Special +P (Model 64); .357 Magnum (Model 65)
• Capacity: 6 Rounds
• Barrel Length: varies
• Frame: Medium
• Material: Stainless Steel

Variants

• Smith & Wesson Model 65 Military & Police— .357 Magnum, medium frame, 6-shot revolver (4-inch barrel model weight is 30 oz. (851g))
• Smith & Wesson Model 65 LadySmith
  S&W Ladysmith
  The S&W Ladysmith and LadySmith are a series of handguns manufactured by Smith & Wesson starting early in the 20th century. Early models, branded Ladysmith, were .22 caliber....
  
  — .357 Magnum, medium frame, 6-shot revolver (weight: 31 oz. (865g))