I've got this Brodie Helmet from an antique item seller a week ago for $29.62 the seller said that this helmet has more dome than any other Brodie helmets ever he got.
The shell is made of non magnetic manganese with a stainless steel non magnetic rim. I've got the shell only without liner and chinstrap.
The only visible marking is '1938' in its chinstrap attachment
any information? thank you for your time