You’ll never see one for sale again! This is the 1st issue M56 (1956) German Helmet Liner with original chinstrap. The original M56 German helmet for the Bundeswehr was modeled after the US M1 helmet with a metal exterior shell and removable fiberglass inner liner. However, in less than 1 year, by 1957, the German Bundeswehr discontinued their use in favor of the M57 Helmet which was still an M1 style, but with integral liner. The M57 shell was made in different sizes, 53, 55, 57, 59 and 61. Whereas the M56 was only made in one size with an adjustable sweatband inside the liner to account for the sizes 53-61 (as seen printed inside this liner). See the liner proof stamps “BUND” for Bundeswehr. Guaranteed 100% original and extremely rare out of an advanced helmet collection.