[JBaymore]

I'm a professional potter. Lots of time in Japan. Don't recognise that piece right off. The seal ends with yama (= mountain). Don't know the first Kanji on that. Sorry. The only pottery location that I am remembering with "mountain" as the last part is Onta Sarayama (sarayama=plate mountain). BUT that is NOT anything close to the mingei / folk tradition of Onta yaki.

best,

...................john