Funnily enough my German helmets are magnetic, which I wasn't expecting.
Only manganese steel (used mainly by Commonwealth countries, the USA and after 1923, France) is non magnetic. Great War German helmets are made or nickle or nickle-chrome steel alloy, Second World War helmets were made of nickle-chrome-molybdenum, or later when some of these metals became scarce, nickle-silicon. Look at the Irish M27, it's non-magnetic but weighs only 1 kg compared to 1.25 kg for an equivalent German Stahlhelm. That's because Vickers used manganese steel, which has to be cold-pressed, and for such a deep-draw helmet had to use a thinner gauge of steel than the Germans did - hence most surviving M27s have more than their share of dents.
Belgian Mk.III - in addition to clones of the Mk.II, HSATs and HSRAC the Belgians made Mk.III clones, in very limited quantities, I will post some photos but in the Mk.III thread to avoid veering too far off-topic.
Here's another raw edge Mk1*, made by Edgar Allen & Co Ltd 1916-18.
Standard khaki green textured paint to the outside & smooth in, Mk1 chin strap & lugs. The Mk2 liner is dated 1939, which looks like the Mk1* was still being issued alongside the Mk2 for at least a year or two, & maybe even longer.