Just picked up a cherry Smith & Wesson model 19-4 357 mag. revolver. Unfortunately it didn't come with any paperwork or box. It has the target grips, hammer and trigger and a hammer mounted firing pin. It is also pinned and recessed. I am wondering what the dash 4 revision entails and if anyone knows aprox. when it was manufactured? I should add the serial number is 64 K4*** . Any info is appreciated. Thanks, Zaman.