I'm standing in my kitchen right now with a very puzzled look on my face, and I'll tell you why.
Some months ago, I was cleaning out my kyusu. I boiled it in water with tealeaves and the boil got little out of control. Anyhow, I came in just in time to hear the boiling water smash the kyusu into the pot it was sitting in, making a very distinctive cracking sound. I cooled the water, pulled out my kyusu, only to find a nice giant crack along the inside of the pot. I was terribly disappointed that day, and have since only brewed whites in it because I was afraid to expose it to higher temperatures. I showed this crack to several of my friends, and they all shared in my dismay, which is why I'm standing here with a very puzzled look on my face.
The crack is gone.
I spent fifteen minutes looking over the surface of the pot and now there is nothing. Impossible, I know, but it's a hand made pot. Markings would be impossible to duplicate. It's definitely the same teapot. Not sure how, but I'll chalk it up to a little bit of magic.
Today is a very fine day indeed.