I have a Smith and Wesson .38 S&W Spl. Ctg., nickel plated with pearl grips and 6” barrel pistol that my grandfather found in a ditch years ago. The first 3 numbers of the six digit s/n is 165. Any info would be greatly appreciated and I’d also like to know what specific ammo it will accept. I know .38 S&W won’t fit. I’ve been trying to find the Spl. Ctg. ammo, with no luck. Thanks