One of two pickups today, 1915 dated and maker marked WWI Prussian Bugle, this type is usually thought to be for signalling as well as more ceremonial duties I would think.
It is very salty with lots of pings and dents and the nickel silver bellmouth cover is loose and hanging off. Unusually it has a cord still attached though I do not know if it is original to it.
I probably paid too much for it considering its condition and the seller claimed it was a battlefield pickup, though quite want that means I am not sure. Presumably looted from a dead German soldier after a battle!