In my experience, 1994 was the year S&W made rubber grips standard, so the grips on your gun are likely original (let me be the guy who suggests a picture as soon as you are allowed to post one). If you want the steel and walnut look, you may change the grips, but it won’t be original.
Welcome to the forum! Perhaps you can I set your sights on a wooden grip model with a serial number that starts with B. 64-5s are 4” square butt revolvers that were high volume with law enforcement, and are available on auction sites and at some surplus and police trade resellers. PM me for specifics.