You don't need to open it... I wouldn't... no point.. There are several good reference books;
https://www.amazon.com/Germanys-Comb...combat+helmets
The above being one of them....
You don't need to open it... I wouldn't... no point.. There are several good reference books;
https://www.amazon.com/Germanys-Comb...combat+helmets
The above being one of them....
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