Fujiwara Teruyasu is one of the most celebrated knife and sword smiths in Japan. The Fujiwara family started smithing in 1870, originally making tools and knives then swords. 

The Maboroshi 210mm gyuto has a shirogami #1 core, carbon steel, clad in stainless steel. Fujiwara Teruyasu is renowned for his 64HRC+ heat treatment on these knives.