Thanks James.....I really wish mine had the nice markings like yours but you can't have everything. They both are very nice pieces, have you noticed the difference in liner tongues that these have compared to any leather or filz OR"s haube? They are wider, more "stubby" in shape. I really think that yours and mine are "brothers", made by the same company, at least the shells were. Yours is a true M15 with feldgrau painted fittings, My fittings are chemically darkened brass and the spike is M95 style. Note also the rolled rim on these pieces which creates an extra step in manufacture, they got rid of that I believe, on the M42 WW2 stahlhelme.
PS: My leather strap on this helmet has brass fittings to match those on the rest of the helmet, are the fittings on your chin strap brass or steel?