Yours shipped about March 1943. How is it marked, i.e., does it have anything stamped on the top strap (United States Property or U. S. Navy)? What is the caliber stamping on the barrel? If not stamped on the topstrap it is probably one made for stateside civilian service, for police or defense plant guards. Grips are very interesting, even though not original. Could be Tuskoid. I'll leave that to others who know more about grips than I do.