German U-Boat Submarine Officer Cap embroidered insignia "Rigid" appearance   Cap worn by submarine officers, U-Boat, during the Second World War. Captain rank Model with embroidery cockad and aigle. Rigid appearance sizes;      M/57 7 1/8      L/58 7 1/4       XL/59 7 3/8 and 60 7 1/2       XXL /  61 7 5/8 and 62 7 3/4 In accordance with the law in force, the insignia relating to the Third Reich have been masked in the photos. Possibility of having other models or other grades too. German U-Boat Submarine Officer Cap embroidered insignia Rigid appearance