This is a brand new mug. I received it as a reward for a crowdfunding campaign, but I already have a mug I love, so I'm putting this one up for sale. The glaze is made by finely kneading the ash of unfertilized rice straw from the Yabakei region of Oita Prefecture. The grayish-white color is a unique pattern that appears during firing in the kiln, created by the way the smoke hits the surface, making each one of a kind.