Hi JDC,
Yes, there is a verybig chance that yr helmet served in WW I. After all, its the 1895/97 type haube, its the last 'shiny' haube to be issued to the soldiers, as when the war broke out, the shining brass trims were considered to be a liability to the user, well, they reflected sunshine! And also to free the brass and silver for war effort.
check out Tony's great site:
http://www.kaisersbunker.com/pe/m1895.htmBesides that, the EM haube, yours is a Prussian Enlisted Man's 40th Fusslier Rgt, was a goverment property, all EM were issued and they were to return the haube to the depot when they were discharged, hence no EM could keep their haube, unless they bought it on their own, hence the term 'Private purchase', but again, EM seldom bought their pvt purchase helmet, one of the reason was the price and the other one is there was no necessity for that as they were issued, unlike the officers, where they were to buy their own haube.
But I cant answer the nice condition on some of these EM haubes, i dont see any 'garniture' marks on yr haube. garniture marks were roman numeral type marks that were stamped when the haube was returned to the depot, and the depot judged the condition of the haube by the marks. And yours have no such marks, which means that it was issued freshly made to the guy and perhaps, just perhaps, he was killed outright when the war broke out, or wounded and his haube was souvenired, or taken prisoners and souvenired again.And all these happened prior the 1915, when the M15 haube was introduced.
http://www.kaisersbunker.com/pe/m1915.htmBut again, this is just my theory as I am still puzzled by the nice/very nice condition on some of the haubes.
Hope this helps,
Mush