Thank you both for the reaction and information.
I looked for Shōzui
I found tsuba Shōzui in the Museum (1st and 3rd photo) and compared it with the signature on my tsuba (2nd photo). Indeed very similar.
Please advice photos in attachment.
1) Can anyone recognize and locate the name of the smith of this sword (Photos KUNI)? I find it difficult tot read the 2nd Kanji.
2) Can anyone give me more information about the smith KUNIKIYO and if possible a rating of the piece.