This is a German fire police M34 helmet with a black leather liner. It is a fire police helmet because of the border around the police eagle decal against the glossy black paint of the helmet – dating it between 1936 and 1941. The left side has the police decal and the right side has the Third Reich national crest. The pad in the top of the helmet is marked size 55.

Germany World War II
Civil Helmet 1934 — 1945
Eisen- und Hüttenwerke A.G., Thale
POH-13-0508