Im Luckily enough to have Shigeyoshi Iwasaki Tamahagane and his modified Swedish steel in both western and kamisori.
Kosuke Iwasaki, Shigeyoshis father, was world renowned metallurgist and blacksmith who founded Sanjo works. Kosuke and Shigeyoshis lifes work was the research of Tamahagane and the Japanese sword. Kosuke also spent 10 years developing Tamahagane for the use in his razors.
My pride and joy 岩崎 玉鋼
I didn't pay anywhere near the silly Ebay prices.