Not easy to find, it seems.  There's a couple of b/w photos of an épinette des vosges player here:  L'Épinette du Nord,  and an Egyptian hammered dulcimer player (the photo isn't old, but it is black-and-white), here:  http://www.rtpnet.org/~hdweb/about/history/egypt.html>Egyptian hammered dulcimer player

You might want to ask on the newsgroup rec.music.makers.dulcimer.