US M1 USMC
The M1 saw many improvements during and after WWII, 1958 saw the most radical changes with the shell size becoming slightly smaller and the liner being modified, notably with the addition of a neck strap and new chinstrap and the liner cradle revamped too.
This Vietnam period example has a liner dated 1967 and a 1963 dated Mitchel reversible cover with the Marine Eagle Globe and Anchor stencil. (Courtesy: T Anderson Collection)
This Vietnam period example has a liner dated 1967 and a 1963 dated Mitchel reversible cover with the Marine Eagle Globe and Anchor stencil. (Courtesy: T Anderson Collection)