Dragon tsuba in katakiribori with sōsho signature

[MauroP]

I've had this tsuba for some years, but far too difficult for me to figure out the mei. Two kanji and a kaō, even hard to take in photo.

Here my best pictures, obtained trough a flatbed scanner.
Thank you for any input.

[SteveM]

When I saw the signature I first thought of Jakushi, but this isn't Jakushi.

However, the second kanji looks amazingly like the sōsho version of Jaku (若). I can't read the first character. I'm wondering if anyone knows of a smith whose second syllable/character is jaku/waka? 

 

囗若　（花押）

[k morita]

Hi,

 如水(Josui/Jo-sui)  +kao　　　

[MauroP]

Steve and Morita, thank you both for your effort.
Once more the contribution of Morita-san shows invaluable for our community.