Back in the mid 1970's I purchased two S&W model 64-1's in .357 caliber. I used one as a duty weapon and sold the second to my brother-in-law. I'm retired now and want to find out something about the pistol. It has a recessed cylinder like a model 19. The barrel is stamped .357 magnum. I was told the model 64 was only chambered to .38 special. My serial number is DN01H03. Smith & Wesson can find no information on the pistol. Any information would be helpful!