Adrian M26 firefighter helmet
Converted during WW2, 1mm thick manganese steel sheel with a raised comb hiding a ventilation slit, painted black and fitted with a brass crossed axes insignia.
A lot of Adrian helmets were converted for use by French firefighters from 1918 to the 50′s, as they were plentiful and similar to the previous brass-made Mle1895 in almost every way.