Now we provide the following zukuri:
Shinogi-Zukuri means a sword which has the SHINOGI-JI.It is also referred to as Hon-Zukuiri.
This shape is very common in TACHI, KATANA and WAKIZASHI while TANTO are usually HIRA-ZUKURI.
Shobu-Zukuri refers to an iris leaf looking sword which has a high SHINOGI-SUJI and a thin MUNE but no YOKOTE.
The sword shape was developed in the middle Kamakura period.
The shape is often seen in short swords such as WAKIZASHI and TANTO.
The thickness on the back becomes thinner towards the tip(from 1/3 for katana, from half for Tanto).
the zukuri refers to a sword that has no SHINOGI-JI. So that the cross-section of the sword is a triangle.
This shape is more common in TANTO, seldom in WAKIZASHI and very few in KATANA.
The Kogarasu Maru, or "Little Crow", is a unique Japanese tachi sword believed to have been created by legendary Japanese smith Amakuni during the 8th century CE.