HI Rob,
Congrats! Thats a neat haube! The liner is still intact and in a good shape, missing onlythe drwstring and the helmet body is solid and all the steel fittings are there and correct. The previous owner(s)had indeed taken good care of the helmet and preserved it in such a nice condition.
All you need is to find a Prussian EM kokarden, and yr haube will be perfect
And yes, yours is a Mannschaften helmet issued helmet, which is an EM haube and a goverment property so to speak.
Yours even have the BA (Bekleidungsamt) marks, BA is the clothing depot that issued the haubes to the soldiers. And BA XV is a Prussian Army corps.
Hence your marks are also correct for the haube.
Yours is refered as the M15 Prussian Line Infantry haubes, well, basically the M15 haubes came into service in 1915 to free up the brass for war effort and to minimize the casualties due to the refelective nature of the brass trimmings.And yours is stamped 1916, which is also correct for the haube.
You have a true M15 Prussian Line Infantry haube there!
Pls refer to Tony der Kaiser's excellent sites
http://www.kaisersbunker.com/pe/http://www.kaisersbunker.com/pe/m1915.htm --> the M15 haubes
http://www.kaisersbunker.com/pt/And yes, the marks
D Estelmann
Stassburg
1916
is the maker's mark.
You have a great display stands, too!
Tony's excellnet sites also features the preservation method for haubes and how to dispplay them properly.
http://www.kaisersbunker.com/preservation/index.htmHope this helps and congrats again,
Mush