Lost grandmother's vintage dark wood violin with small scratches and black case left on a bench by the river in Dubuque.

I left my grandmother's vintage violin on a bench while I was enjoying the view of the river during my walk yesterday. When I went back to get it, it was gone. The violin is a dark wood, with a couple of small scratches on the body and comes with a black case. It means so much to me, so I'm hoping to get it back.