Reproduction WW2 German U-boat cap badge. 
U-221 used this device. 
Made of brass with 2 prongs on back for fastening. 
Size is 2 3/4 x 7/8 inches 

Listing is for one pin, photo shows front and back.

Repro WW2 German U-boat cap badge u-221 Kriegsmarine Submarine

$20.00Price