GOSHI KAISHA SANIN SHOKAI.

The FOTW version from Fune To Hata, dated 1916 and captioned Sanin Kisen, shows the diamond’s outer arms wider than its inner arms, with a vertical arm extending above the diamond to a point. Alan Watt identifies this as incorrect: all white lines should be equally wide, the vertical line should not extend outside the diamond, and its top is described as chamfered. Rosanoski interprets that last term as a groove.