IN trith, tetsugendo works that are signed are rare. For some reason Seiryuken Eiju seems to leave us quite a bit of examples of different quality. After much study and discussion in Japan, it is possible that Eiju had students, and had them make or finish tsuba, and having him signe dthem afterwards. The different Kakihans could belong to the various students. But the one on my usagi tsuba resembles the main tetsugendo style kakihan the closest. Also this is the only piece with this design, therefore enforcing the possibility that Eiju made this tsuba himself, not like the may dragons, stipled pattern type that are most commonly seen. Just my 2 ccents worth.