M42 Wire Sea Relic Helmet.
This example i purchased last year to study the way the wire was attatched to the helmet, interesting that the wire is a plastic covered type, perhaps a phone line and has been attatched the chinstrap bales. Anyway it would appear to have been found from a water sourse, river or ocean, there are numerous shells to the inside and grass growing on top of the lid. Makes a great display and the shell is sturdy enough. Hey if you want a German combat helmet with no doubt that the wire was period applied then this one fits the bill.