The helmet appears to be a black m40 german helmet with some type of puncture wound to the shell which could be a bullet hole. On the inside of the shell on the left rim is stamped what appears to be ET62 but the markings are hard to distinguish. The back part of the rim has four digits stamped on it which could be 1085 or 1935 or 1985 or 1035 but I'm not sure.
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The vent holes are stamped into the shell. The split pins seem to be original but are loose indicating the liner has been taken out or replaced. The leather part of the liner appears to be from ww2 but probably not original to the helmet as it is of an m17/m18 three pad style. One of the leather parts has ink stamped on it an eagle holding a wreath. The leather strips between the three pads are a lighter color leather and there is written 'HASSELFELT' on one of the strips. The liner brads that hold the leather to the metal liner band appear to have green writing on them and look modern.
I can not find any markings on the metal liner band. The liner is painted green but there is a lot of paint chipped off. This could be a replica used to complete the shell; not sure.
The chin strap has stamped 'R. LARSEN BERLIN 1939'. The strap does not look like it has much wear and the leather is shiny. This could be a replica used to complete the shell and/or parts of the liner.