Police Magazine info question

[sdmark777]

I have an Haenel Schmeisser luger magazine I would like to know more about. It is marked on the bottom with a "2" for second magazine, an eagle stamp and no serial number. Ok, so it is a police magazine. What I would like to know is this. Is this an extra mag that went out to a police armorer and they just did not bother to stamp it with a serial number? yet they stamped it as a #2 mag? So kind of confused how this process worked. Also, what time period this mag would be appropriate for issue with a luger by police? Thanks, Mark