The serial number appears to be from the time period of the late 1920's (an r suffix)
The crown N on the left of the receiver is a commercial marking - so I would say at first that it started as a commercial, then went into the army or police (likely army). The markings on the right look like rework markings (HZA markings are a Weimar depot), but are not close enough. I do not think that is an Erfurt proof on the far right. For one reason that if cleaned up from WW1, I doubt they would leave just the proof.
It is NOT a Mauser bump on the rear (see the FAQ)
Keep in mind that many, many WW1 guns were cleaned up (most markings taken off) and resold or reworked.
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Edward Tinker
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Co-Author of Police Lugers - Co-Author of Simson Lugers
Author of Veteran Bring Backs Vol I, Vol II, Vol III and Vol IV
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