Early-mid 20th C. Chokwe Peoples Storyteller's Sanza (Thumb Piano) - D.R.Congo. Wood with metal; rocks inside. Size: 10 x 9 in. In very fine condition; playable and beautiful tone. Very deep, aged, shiny, dark brown patina from years of handling and use. Provenance: Florida private collection, 1990's. An authentic and original traditional African instrument. Very usable and with amazing sound and contains bits of rock and bone and other materials that rattle and crackle with the player's movement.