japanese? studio pottery

i put this up a little while ago, but pic seems to have disappeared as i think i put it in the wrong thread.  Anyhow, here it is again and slightly more in focus hopefully.  I'm not sure if it's Japanese, Chinese or other. Neither am i sure which way up the mark should be read.

Japanese, I think. Bizen? Mark looks upsidedown to me.

many thanks - that's a starting point for me to look at. :-)

It is Japanese and, although the firing style looks like that of Bizen the stoneware body and the shape are not typically Bizen.

The mark also doesn't look like that of a Bizen kiln, as it has too many kanji. Therefore, I suspect that it is the mark of a company that sources pots from all over Japan, as with Naomi's shino vase of a few days ago.

https://www.20thcenturyforum.com/t15559-japanese-shino-ware-vase