I reached out. Looks like it came from 267 Grenadier 94 Infanterie Div. They were out of Italyapparently. As for tracing the name, he mentioned there are quite a few Petzold's. Would need someone to look through the files in Berlin since nothing is digitized.
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Single decal. Confirmed with my father in law. He apparently has a notebook from his father that documents all the items he had. Its a matter of finding it he said. Misplaced 30 years ago. He may have more info about the helmet in there. He had note cards for all his rifles and pistols as well, outlined date, place of purchase and price.