I stumbled across a page at the University of New Hampshire, which provides an iconography (list of references to images) of the 16th Century hurdy-gurdy. Sadly no illustrations, but a comprehensive list nonetheless.
"The purpose of this iconography is to answer the question "Where can I find an illustration of …?" I have included only works of art for which there is a published reproduction (plus some that are in the Visual Collection, Fine Arts Library, Harvard University and a few in the Bild-Archiv Photo Marburg).”
Read more here.