WWII GERMAN LW AIR SIGNALS 'B' CLASS RADIO OPERATOR'S TRADE BADGE

The badge consists of a roughly, 58mm diameter, Luftwaffe blue/grey wool construction base with a machine embroidered, central serrated horizontal bar with eight 'lightening bolts' emanating diagonally outward from the center with four lightening bolts to the top and the other four to the bottom of the central bar, all in silvery/grey threads.