Original German named WW2 M35 Kriegsmarine Costal Artillery camouflage steel helmet. This is an SE made helmet for the KM. SE had the second KM contract that only was for M35 helmets, contract started pre war and ended in 1940, decal is the true gold KM type made be ET and used by both ET and as here SE. The helmet was a double decal, hand overpainted as per 1940 regs and then subsequently Camo painted for coastal artillery use.
KM specific, Rank and name to the rear for a coastal (Art) Maat (Mate).