Aluminum frame could be P.38 as well. Many years ago, I had a NIB Walther "1886-1986" marked postwar pistol with "P.38" on slide, that one has aluminum frame. Also had another plain postwar aluminum Interarms marked "P.38". The magazines of those are not numbered to the gun, but marked P.38. The current one in my self-defense plan is an Interarms P-1 though, having P1 marked magazine. Basiclly, I have never played a steel frame P38 nor P1

and curious on its weight.