Hi Chaps,
I was puzzled by this M15 kurassier helmet, at first I thought that it was a put together helmet, a M15 JzP helmet body ( well, a M15 JzP has a blued/darkened body), but upon looking at the details, I was surpised, it has no 'step visor', a football shaped spike base and the typical M15 Kurassier removable spike. Which indicates that its original. Frankly speaking, I didnt know such blackened M15 Kurassier helmet exists.
And it does exists! The maker is Weissenburger & Cle, Cannstatt, the maker's mark is attached with a metal tag inside, not stamped.
http://cgi.ebay.com/WWI-PRUSSIAN-EM-SPIKED...1QQcmdZViewItem
Hope this helps,
Mush