Japanese Sword Guide by Richard Stein

[Rich]

My "logo" tsuba is a Ko-Katchushi (see the Elegant Iron tsuba page
for the full exampe). The design is taken from the double comma of
the "yin-yang" design (don't know the name in Japanese). It's a pretty
classic design element in lots of oriental work including Japanese, Chinese
and Korean. Without the rim it would just be termed a Katchushi tsuba.
Glad you've found the site useful.

And BTW, drop the Professor Stein stuff; I'm just
Rich