Antique musical lock and key from an old wood dower chest. 1890s. Handmade

  
Antique musical lock and key from an old wood dower chest. The lock and the key were made in 1890s by my great grandfather. They're almost 130 years old. While the key is being turned, it touches the springs inside the lock, so it vibrates and makes sounds of two different tones. Length of the lock - 13 centimeters.