Saw This Old Dulcimer ...
General mountain dulcimer or music discussions
It's cool, and it looks pretty old, but using the guitar-style frets is a relatively modern twist. Looks like a few frets are missing from their slots.
Maybe the restaurant manager will let you carefully remove it to try it out? They probably stuck it to the wall with screws driven through the soundholes.
That's how an old John Maxwell dulcimer was attached to the wall of a T.G.I.Friday's, before they tore it off and sold the wrecked dulcimer on eBay. I won it, and carefully reglued the splinters back together. I should think somebody would have had the sense to look for screws attaching it to the wall...