The Four-Faced Head

I found this chap at the Alemany Flea Market in San Francisco. I think he’s Chinese, but only because the person who sold him to me said that. He is brass, I think, and he is about the size of a Granny Smith apple. He has four faces: sad, worried, smiling, laughing, and you can turn one to face you depending on how you feel, or want to feel. He’s a bit damaged, with some kind of tarnish I’m not sure how to clean. But I don’t mind.