Smith & Wesson J Frame Model 640 .38 Special Hammer - Stainless Steel Old Style J640107 4013 If no model number is

If no model number is present

Factory Finish: Durable black coating matches the M2

39-2 9mm Important: This part is specifically designed for Model 39 series pistols

40 S&W Slide

Part number M659S

Smith & Wesson J Frame Model 640 .38 Special Hammer - Stainless Steel Old Style J640107 4013 If no model number isGenuine S&W Model 640 Hammer Assembly Old Style This genuine Smith & Wesson hammer is designed specifically for J Frame Model 640 revolvers chambered in . 38 Special. Manufactured from durable stainless steel, this old style hammer component ensures reliable ignition and consistent performance in your classic revolver. Key Features: Genuine S&W Part: Factory component ensures perfect fit and function Stainless Steel Construction: Corrosion resistant