If the picture shown on the front page is the revolver you are talking about then you can't tell yet. The picture I saw with the rear adjustable sight and the HEAVY not pinned barrel makes me think it very well could be a K-38. But to make sure, the grips on it is the large oversized S&W factory grips. You need to remove them first then you can see the serial #. Don't go by the only one you see up by the cylinder. Remove the oversized wooden grips that cover the butt frame and you then can see the factory stamped serial #. Hope this helps.