The image of the man in the full panoply is really close to our Prodromoi mask; however, there are actual examples of the mask in question. Urnamma (his unit, after all) and Paullus have seen it. Although finding the citation in their notes for it or remembering exactly where it was seen is a different matter.

Examples of masks exist, but it seems that whenever you do a search for them in Google all you get are Roman examples, which is frustrating. I seriously can't help but think that it is published in some German or French article from long ago (and you thought you just needed to know Greek and Latin).

One nice example I found is an bronze, Etruscan, ritual helm. The crest holder up top is bent, but it would have held a truly massive crest.