The circle indicate the time we are discussing in this section
Chukan-zori (中間反り)————— The back of Tanto is straight. Unlike Takenoko zori, Chukan-zori does not curve forward or does not curve outward. Hamon (刃文) Tempered line———–Sanbon-sugi (三本杉), O-notare (大湾), Yahazu-midare (矢筈乱), Hako-midare (箱乱), Gunome-choji (五の目丁子), Chu-suguha (中直刃). Carving (彫物) —————Often grooves
Tanto Length ———————— Tanto is one Shaku (12 inches ). Standard size Tanto is called Josun Tanto. This is 8.5 Shaku (about 9 inches). Longer than Josun is called Sun-nobi Tanto (寸延) Tanto. Shorter than Josun is called Sun-Zumari Tanto (寸詰).
Takenoko-zori Josun (筍反定寸) ———– This type of Tanto is made during Sengoku Period looks like Rai Kunimitsu of Yamashiro-den. Hamon (刃文)———–Hoso-suguha (細直刃). You see Katai-ha somewhere (Below illustration). Masame- hada appears Mune side. Jitetsu (地鉄)———Whitish surface and sometimes Shirake –Uturi that is the whitish faint cloud-like effect on jitetsu.
Sunnobi-tanto (寸延短刀)———-Looks like the one from the end of Soshu-Den, Sakizori tanto. You may see Hitatsura. The condition of the Hitatsura Hamon shows on the lower part of Tanto more, less on the upper part.
Hirazukuri Takenokozori- Sunzumari-Tanto———–This is a unique Tanto for Sengoku-period. Hirazukuri is flat-surface sword without a Shinogi, Yokote line, or obvious Kissaki. Takenoko-zori is the shape of the bamboo shoot, that means the back of the sword curves inward. Sunzumari is shorter than 9 inches long (shorter than 8.5 shaku, 25 cm). The width of the lower part of the blade is wide and thick, the width of the tip is narrow and thin. It has sharp look. Carving(彫物) ———Deeply carved Ken-Maki-Ryu (a dragon wrapped around a spear). Hamon (刃文)———–Tempered line is wide. Nioi base. Irregular Hamon or wide Suguha (straight) and Chu-Suguha (medium straight). Return is deep. Jitetsu (地鉄)——fine and wood burl.
Moroha-Tanto (諸刃短刀)—————-Double-edged blade with a Hamon on both edges. Often Bonji (Sanscrit) is engraved. About 9 inches long. Hamon (刃文) ———Tempered line is wide. Nioi base. Irregular Hamon or wide Suguha ( Straight) and Chu-Suguha (medium straight). Return is deep. Jitetsu（地鉄）——- Fine and wood burl.