If everything including the grips are original, I would say between $275 and $350, depending on condition. The box can add a little more value to this. During that period walnut was used as a grip material and Goncalo Alvez was used later in production. It should be an XR3 Red grip frame too. I usually look Rugers over real good since the parts can be swapped. It should also have a steel ejector housing too.