Hohner Pro Harp MS, a high-quality German-made blues harp. I used it for lessons about 15 years ago, but I owned several, so it wasn't used heavily. It produces sound, but I cannot confirm any pitch discrepancies. Please purchase only if you understand this. I have not disassembled and cleaned it, but I have carefully cleaned it with alkaline electrolyzed water. - Brand: Hohner - Model Name: Pro Harp MS - Country of Manufacture: Germany - Model Number: 562/20 MS A PRO HARP Thank you for looking.