A WW2 period time Czech M34 helmet which was worn by a Cossack volunteer serving for the Wehrmacht. Cossack Wehrmacht soldiers served in ex Yugoslavia for the German forces which is where this helmet was found originally.

See Angolia's publication on badges of foreign volunteers for a photo proof of a Cossack wearing a Czech M34 with the same style of the cross. 

The painted white cross is absolutely genuine and authentic and was painted by hand. It is covered by some rust which is also to the rest of the shell. The shell has its original Czech lining attached and comes with full factory paint-

Size 56. 
Condition 2-