I found this bowl. It looks like it's hand carved. It's stamped Japan on the bottom. My question is, what is the weird thing in the center of it? It looks like a bundt type bowl or something but it has a washer or something with a screw in the middle of it. I just cannot figure out what it would be used for. Maybe it's not a bowl at all? I don't know. Need your help please. Any ideas?
Thanks!
Thanks!