Review Any clue who made this knife and what is written there? (Santoku)

The maker is "Sakai Suketomo" 堺 助友
Under that is the steel type "Haisu Kou" ハイス鋼 means Haisu Steel.
Haisu is Japanese for High Speed which with Japanese makres
usually means R2 or SG2 as the core, with a a softer stainless cladding, such as 420j2.
 
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