尾張三作 Owari Sansaku
尾張三傑 Owari Sankei
What is Owari Sansaku/Sankei in Japanese Katana terminology?
"Owari Sansaku/Sankei" refers to the three representative swordsmiths from the "Owari Seki" school, which flourished after moving from Mino Province to Owari Province. These include "Sagami no Kami Masatsune", "Hida no Kami Ujifusa", and "Hoki no Kami Nobutaka".