There is no potter's mark on this shiboridashi, but it is guaranteed as an authentic Jinpachi piece.
The edge of the lid knob is slightly depressed on one side, probably by the hand of the potter.
It is lightly covered with glaze and is a small reminder that the teapot is truly handmade. Handcrafted in Kasama city, Japan by Jinpachi (Mr. Ogawa Jinpachi)