The full speedloader cut out on the left panel didn't appear on the K frames until about 1978 or 1979. From the mid-1950s until then, it had what is known as a "football" cut, which was intended to allow extraction without damaging the wood. If your revolver shipped with target stocks (most K-38 Masterpiece revolvers, including the Model 14, shipped with Magna stocks), they would have been the football type.how can you tell the grips are later grips please??