We inherited a S&W revolver: S/N 5565xx, 4" barrel, black (hard rubber?) cross patterned grip, right side of barrel marked 38 S&W special CTG, left side of barrel marked Smith & Wesson, the S&W trademark is on the left side of the frame of the gun; it holds 6 bullets; the metal appears black but may be what I am seeing referred to as "blue", except trigger and hammer are a nickel colored metal. We also have a box of "remanufactured" (that's what's printed on the box) 38 special ammo. Is that appropriate for this gun? Any idea how old this gun might be? Many thanks