Nice one with the original pickle, this one is pre 1900 for sure. The model "Kask M/1887" (Swedish word for picklehaube) were used in the both royal Svea & Göta infantry life guards (livgardet) here in Sweden by the time, this one is for the NCO foot soldier.
BTW the cockade is sitting on the wrong side on the haube, it should be on the the right side of the helmet