Hi Scott,
I do not know of any Wurtemberg spike helmet with rounded visor and cruciform spike base. Not even for police, customs...
This one has mostly features of an enlisted helmet, with a couple of more officer-like traits: rear spine, spike base. Spike base attachments look funny.
I would think of a post-war production as they used in marching bands, for instance, or for commemorative events.
Something you may like the appearance of; a "decorative" item as they write euphemistically in auction catalogues, but remote from WW1 history, in my opinion. Definitively not a WW1 headgear collector's item.
Other members of this forum will have perhaps more positive opinions...