Unissued Original German WWII Kriegsmarine Anti-Aircraft Range Finder Operator NCO's Career Sleeve Insignia

Unissued Original German WWII Anti-Aircraft Range Finder Operator NCO's Career Sleeve Insignia-The insignia consists of arange finder positioned on an equilateral triangle which encompasses a flaming artillery shell, above a double chevron -- which is machine embroidered. Cloth backing is intact.