Stoneware studio pouring bowl, Japanese? no Mark.

A bit odd for practical pottery as it’s unglazed on inside and incised
And a grittier clay outside with a thin dark olive green glazing.
No mark

Isn't there an incised mark on the base under the ash?

If there is a mark it is too obscured to see. Odd clay in this. Maybe foreign?

I am referring to the squiggle within the dark line that I have added. I think that it is wood-fired, Japanese and possibly from the Bizen area.

Could be a grinding bowl, due to the lines down the sides. There would have been a wooden pestle. The coarseness of the clay might point to shigaraki or Tamba  ware

Thank you Studio and Naomi. I am well outside my scant knowledge area now! I will find out a bit more. I can see it’s an interesting pot but just so different to what I usually come across.

From my experience the stoneware body is not right for it being from Shigaraki, as the clay would be lighter in colour.

That's why I ruled that out. Naomi's other suggestion of Tamba (or Tanba) does use a variety of clays and the clay of your piece could mean that it could be Tamba rather than Bizen.

Thank you. I can always say Probably Japanese, Tamba ?
I don’t like to get things wrong when listing stuff.
Many thanks.

I would be confident in saying that it is Japanese & wood-fired and leave it at that.