Original U.S. WWII M1 Helmet Liner by MSA with 131st Armored Tank Battalion Insignia colts such as a built-in compartment

such as a built-in compartment for spare parts

The grip is molded bakelite or gutta percha

The lid of the transit chest is marked with much of the same information

fusee with fittings

Original U.S. WWII M1 Helmet Liner by MSA with 131st Armored Tank Battalion Insignia colts such as a built-in compartmentOriginal Item: Only One Available. This is a very nice example of a genuine WWII "High Pressure" helmet liner by Mine Safety Appliances (MSA). The liner looks like it was then reissued for training use, possibly post war. The liner is marked on both sides with the unit insignia of the U. S. Army 131st Armored Tank Battalion, which is the standard armored unit triangle, with 131 at the top. Helmet liners such as these were often worn during training,