Your blade has similarities in the yasurime to some of the Emura blades I have seen, such as this one: https://www.aoijapan...a-emura-saku-3/
Here is a link to a search on sold items from AOI Art for “Emura” in case the link doesn’t work for you: https://www.aoijapan...s=Emura&x=0&y=0
I am no expert, just merely suggesting the similarities since no one has mentioned Emura yet. I hope this helps you with your research. Good luck!
Fascinating parallel! I feel like this would be unique for an Emura tachi. Now I'm off to sift through Emura references.
Thanks for the lead Mark!