Hello, I am looking for information on a hira-zukuri wakizashi that is signed Bishu Osafune Tadamitsu. It has horimono of fudo-myo but above that it looks to be of a rock scene with waterfall falling above Fudo. I have not seen two horimono carved into the blade surface like this on other swords. Is it possible it was to cover kizu or added as decoration at later? Thank you for any information or thoughts.
Regards
Brian