Hi. I've just aquired this helmet and need some help.
All date and manufacturer markings are painted over. Helmet is painted with textured green paint outside and in. Partial remains of helmet liner are in place. The outer of the liner cross members seem to be red in colour. Liner centre is marked R S Co 2 1/2. Liner cross members and centre are fixed in position by an outer nut and inner rivet/washer and is non removable. Bales are 3cm in width with right angles removed.
I was thinking 1942+ but I've not seen a liner assembly like this before.