This is an Hourglass style mountain dulcimer. This one has 4 strings. Some come with 3 and as high as 6 strings.
This one was handmade for me by Ken Hamlin in 1984. It is one of several music instruments I have.
It's been a long time since I played this one. The mountain dulcimer is usually played with the instrument laying across your lap. The noter is used to slide along the fretboard and you strum the instrument. It's a lot of fun.
My other musical instruments I have include a Yamaha electronic keyboard and several Penny whistles in different keys of C, D, and A.