These are probably some of the most coveted British helmets besides MkI helmets. Used by Britain from 1944-1984, these are hard to find and very collectible. The MKIII was implemented in 1944, and issued to British and Canadian troops just prior to the Normandy invasion. The MKIIIs were only issued as shells, and the soldiers were to remove the liner from their MKII "Brodie" helmets and place them in the new MKIII. This makes the liners interchangeable with the MKII helmets via a screw and washer, and this variant is quite uncommon in the U.S. today. MKIV Helmets were designed with a "lift the dot" post welded on to the inside of the helmet shell. The new liner could simply be "snapped" in to place and replaced very easily. The shell remains the same as the MKIII, but with the improved liner attachment system. These are more common, thus reflected in the price. Note: These liners are in old but still okay condition. The criss-cross padding at the top has been melted somehow, and liners are listed as "Grade 2" for that reason. The helmet itself is complete and in good shape otherwise, it's just the melting of that pad that curses these particular helmets.Stock photos are examples of what your liner may look like. Despite pad being melted, these are all in pretty good condition for being 60+ years old.