Sadamasa (定正) is considered to have continued for 3-4 generations from around the Kanbun era (1661-1673). He is said to belong the Umetada school in Kyoto.

The 1st generation being named Ichirōemon 市郎右衛門 and bearing the surname Fujiwara 藤原.

In this Tsuba, made of iron with a polished round shape, auspicious symbols such as Noshi (ceremonial strips of dried abalone), a cooking knife, and a Hōju (sacred jewel) are delicately placed in a method of negative openwork with sharp chisels. The two sides of a abalone made of Shakudō are inlaid using zōgan technique on the back and front.

Resided in Tango-Tanabe or Miyazu.

Mid-Edo period.