Polizei / Feldgendarmerie traffic stopper. With rivetted maker tag "Dr. Benöhr's Elektrischer Signalstab, Hamburg 1. Complete with red and green glass and properly marked with the "Wa" stamp on the disk. Dated 1941 on the messing connector. Very good condition with all paint intact. Botton screws off for battery. 

Fantastic item, extremely hard to find!!