A bronze shield cover from... ?

I've finally tracked down the Axel Guttmann violin-like shield I mentioned back in 2012.  It's not quite the shape of the violin shields seen at Persepolis and is much smaller (only 18 inches/46cm across).  Other differences are obvious upon viewing, and running the page through Google Translate I find that a "Prof. P. Schauer, Regensburg" (presumably Peter Schauer) assigns it a Hittite origin.  I don't know much about Hittite shields in the Iron Age, but in the late Bronze Age they used shields of a similar shape.  FWIW, Matt Amt has suggested that these gave rise to the Dipylon/Boeotian shield of Greece, thus raising the possibility that the Greek and Persian shields derive from a common ancestor.