I know my fruits and veggies Frank (wink) it is the shades of grey by manufacturer in the M40.M42 models where you have the resident examples and where I bow to your expertise LOL. ;-)
Out of the two examples posted, the paint I can see on my helmet looks closest to the latter. Beautiful helmets, by the way.
I was just looking at German helmets for sale on Espenlaus Militaria, and came across one like mine (M42, no decals) which is referred to as possibly originating to the Heer or Waffen SS. It made me wonder if my helmet could have been worn by an SS man? I originally assumed that only the Heer used helmets without decals- but is it possible? I know most sites will say such things just to make a sale, but from what I've read this is a reputable site. The helmet I refer to seems to be grey, so I assume this would indicate potential origin? Mine shows traces of green, as discussed.
The helmet's here -> Original WW2 German militaria, WW2 Red Army militaria, WW2 Soviet militaria and more...
On an unrelated note, my helmet seems to be a very small size... it won't even nearly fit on a polystyrene mannequin head I have, nor my head (I carefully tried out of interest, but stopped before putting any pressure on the liner).
Nevermind, I just went back and saw this was already covered. Possible but unlikely.
M42 with no decals would be Heer or SS. Sizes ranged from the super small 60 to the super large 70 with 72 even made. The size is stamped into the metal skirt and goes up by 2's.