David, your photos are actually quite good.
I agree that the letters and numerals in this marking are both 3.1 mm as in G.K.128. Apparently, the GK was not a stickler for uniformity.
The mags are both from the Schutzpolizei of Hannover. The S.Hn. marking predates the S.H. but it is neat that they are matching #1 and #2 mags (HWIS Chapter 9).
The holster appears to be a shoulder holster. Hopefully, someone with more knowledge of holsters will comment.
A very interesting and eclectic rig!
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