You're posting thumbnail pictures rather than the actual full images.
Hard to see any detail. Get images at least 1024 pixels wide and post them.
I can't seen enough detail, but in any case this would not be the "RHSA". The marks are probably Prussian region Weimar period for the Schutzpolizei in Schneidemuhl district. I don't know why the "S.S." was double stamped. Perhaps re-issued to another unit within the district. Generally the last number in the sequence is the individual weapon number issued to a unit.
You can learn details about this kind of marking here:
http://www.radix.net/~bbrown/police_unit_marks.html
There are others on the board with a great deal more background on unit markings that might have more correct information than I do.
Is it possible that the numbers on top of the receiver are "1920" over "1918". If so, it would be a 1918 manufactured Luger with a "1920" Weimar property mark (not a date).
Marc
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Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.