It is a special order to Takami Tanzo (Chiyozuru style Rentetsu (wrought iron) / White I steel blade Kamisori
Chiyozuru means Chiyozuru Korehide who is the one of the most famous and admired carpentry cutlery blacksmith in last century.
His cutleries are mostly seen in museums.
I asked to Mr. Amano (Takami Tanzo co.) several years ago to make one kamisori like he made.
It has been over years, and finally, he made one like this for me.
It is kind of large size kamisori, but it is extremely brilliant look.