Gday, I finally took some photos of my first aussie lid in response to Micks thread. It is has the name Alder on the underside but no service number unfortunately. The chinstrap lugs are mark III and undated . I cannot see any other stamping. The size is 7 1/2
Im not sure if this is a mkII or mkIII helmet maybe sombody can enlighten me.
Also the net was added by me for display