This is a P.38 shoulder holster.  There is no spare mag pouch but a P.38 fits perfectly and you can see the imprint of a P.38 on the inside.  Besides being extremely well made, this is the only example of a shoulder holster that I have seen that is waffenamt stamped.  The stamp could probably be applied by moving the belt loop aside.  In fact it looks like the stamp was placed there before the rivet was installed.  I can't explain that.  If someone wanted to fake it they would likely have stamped it in a more visible location.