Oriental Tea Bowl

Another mystery pot from my attic. Unsure if this is Oriental or European. Not very old but country of origin would be nice.
Height: 7cm

I think it's Japanese but I can't tie it down to a specific pottery town/area.

It's the kind of thing that, as it has no mark, wishful thinking sellers would attribute to Shoji Hamada. Not his decoration............. sadly.

Thanks studio-pots, you are very helpful.