Police marking

[maddog350gt]

Hi all,

I have a Weimar/Nazi police gun (sear safety, disabled magazine safety) with unit marking G.P.O.20; I have looked in Gortz & Bryans and found references to a P.O marking for one of the police schools but no reference to the G. Any thoughts from the group on what this means? BTW it's an over-stamp of imperial marking 66.R.M.G.4

Thanks,
Bob M.