FWIW I have a 1920 alphabet police Luger #1465a. proofed E/ArA4. Front grip strap marked "S.Hn.II.5.117." Matched alum bottom mag #1 Sunburst/S, marked on spline "S.H.II.5.117." Mag markings are smaller than those on grip strap. Perhaps it was common to drop the "n" on mags.
Regards Ken D
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