A nice looking and original Kriegsmarine Naval Artillery specialist badge. This badge would have been worn on the sleeve with a zinc backing plate on the inside of the garmet. Backplate is sadly lost to history.  All 4 prongs remaining on the reverse. Displays well. 
 
The Kriegsmarine was the navy of Nazi Germany from 1935 to 1945. It superseded the Imperial German Navy of the German Empire (1871–1918) and the inter-war Reichsmarine (1919–1935) of the Weimar Republic. The Kriegsmarine was one of three official branches, along with the Heer and the Luftwaffe, of the Wehrmacht, the German armed forces from 1935 to 1945.