"Can anyone guess as to what caused the cracks in the shell? "
Metal fatigue in my opinion. These helmets are made from flat sheets that are bent into shape, and clearly this sometimes leads to the metal cracking, depending on the exact helmet and the way it was kept.
WWII US helmets almost all crack around the edges.
I often hear concussion being mentioned, but this is IMO incorrect, particularly because you often see helmets that clearly were in a consussion, but that dont have these kinds of cracks.
Metal fatigue in my opinion. These helmets are made from flat sheets that are bent into shape, and clearly this sometimes leads to the metal cracking, depending on the exact helmet and the way it was kept.
WWII US helmets almost all crack around the edges.
I often hear concussion being mentioned, but this is IMO incorrect, particularly because you often see helmets that clearly were in a consussion, but that dont have these kinds of cracks.
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