In 1940, the M1935 German helmet was made into what is known as the M1940. The difference between the two is in the air vent holes. "The M1940 has a stamped air hole made to look like a rivet, instead of the actual rivet found on the M1935." The M1940 is made of steel made from manganese-silicon. The M1940 also was manufactured through a process of hot stamping the metal. The M1940 is like the M1935 similar to the rolled steel edges. This came from
this ebay website.
It is also known as the double decal. This is one of the rarest recovered helmets in history of WWII.
"At the end of March 1940 the first M1940 model helmets were placed into mass production for the Waffen-SS. At this time regulations still held that each helmet be given double decals like the M1935 pattern helmets that preceded them."^^^
