A South Indian Jew's harp, an instrument called a Morchang, Murshing, or Morsing. I had a professional tabla player friend buy this for me in 2003 when he went to South India to learn about the Morchang. It's a high-quality instrument. The rust has been removed, and it has been oiled and wiped. Made of iron, 117mm in length, key of "E". It has a good volume and a strong percussive attack, with a sharp, metallic sound. I have eight of these, so please comment if you would like to purchase multiple (the photo is of instrument number 1, in E).