Original German WWII M31 Zinc Helmet Liner Size 64/57 & Dated 194?

Original German WWII M31 Zinc Helmet Liner Size 64/57 & Dated 194?This is an authentic, WWII German M31 helmet liner featuring a zinc band, size-stamped 64/57 and dated 194? -- not able to read the date. The leather is stiff / dry and a few of the fingers are damaged. The reverse side bears an ink-stamped size 56 and a RBNr. The metal band is both maker-marked and dated. There is rust and corrosion throughout. The original drawstring is missing. Overall this is in fair condition -- the band is still in solid condition even though there's surface rust.