Wehrmacht issue hand operated air raid siren

Unissued Wehrmacht issued hand cranked air raid siren. Standard vehicle item that is extremely scarce to obtain in complete or working condition. The sirens comes with the original cloth sling. The original paint finish on the zink/aluminum based hardware still retains up to 95%. The piece is nicely dated 1939 and is maker marked Helin. Incredibly scarce item that would nicely compliment any equipment or vehicle collection!