United Kingdom MkIV

The MkIV is the same shell as the MkIII, the major improvements were the "Lift-A-Dot" liner retainer as opposed the nut and bolt of the MkIII, this made the shell watertight for use as a wash bowl like that of the USM1.
​Also of note is the chinstrap rivets are placed in a lower location, closer to the rim, than the previous version.
​These helmets were introduced in November 1944.
​(Courtesy: T Anderson Collection)