Rob,
It's chambered in standard .38 special, not .38 S&W. See the below description from the S&W Standard reference guide.
The Smith and Wesson Model 64 Military and Police revolver is the stainless steel version of its Model 10. It is a six shot revolver chambered in .38 Special.
Not sure of the value, but looks like it's in good shape on the exterior anyway.
Gene