At that time i can find a number of kiyomitsu smiths listed, in kaga there where 2 generations of kaga, 4th and 5th. There where also kiyomitsu smiths in Bizen, Mino, Suwo and satsuma. Obviously there may be more, but these are the the kiyomitsu i can find listed. Below is a picture of the tang on my suriage kiyomitsu. I was under the impression it was o suriage but not so sure now.
Alex.