Vase, studio? Japanese?

Bit lost here,
9” vase or bottle.
Looks like tenmoku type glaze with circle pattern.
Japanese? Saki bottle? Decorative vase?
Is it a thrown studio piece?
Base has some kind of mark.

Could be Japanese or Korean. More likely a vase with that long narrow neck

Thank you. Thrown do you think? Hard to tell.

Yes, I expect it was thrown. It could have some age

Oh dear, I suppose I have to find out about it properly. Or leave it on the windowsill awhile.
Thanks, Naomi, I wasn’t sure if I’d bought well or not.