Unknown German Civil Police Shako Eagle Antique & Militaria

This is a German Civil Police Shako Eagle,made in high-quality aluminium and is near mint other than the fact that it is missing a washer and nut from the right-hand side, but it should be fairly easy to buy a nut and washer that will fit or buy a washer that fits and age it to match in or to file a nut down and age it to match but as this will probably be in some sort of display,you would not be able to see the missing nut and washer any way .