4 ms·

It looks like an old differential gear housing.

• PeterWhittaker 8y ago
  It really does.... :->
• Finnucane 8y ago
  Heh, I guess it's an eye of the beholder thing. Not long ago I bought a banjo, and since banjo things have been on my mind, as soon as I saw the picture, I thought, that is a spiked lute.