It took me some time to find anything on Tsunahiro but i believe it’s this one :
Tsunahiro who is said to have been a student of Tsunaie, who was himself a student of the 1st Shimada Yoshisuke, was a skilful smith amongst them and demonstrates a Soshu-den that reminds one somewhat of the workmanship of old Soshu smiths.
Tsunahiro was the most skilful engraver and the smith name is succeeded up to the Edo Period.
source
This is well worth the read as well if you like this geeky stuff 🙂 : Sandai Soshu Tsunahiro Â
Picsource :Â nihontoantiques.com/
