The discussion in this section is about the famous Muramasa (村正 ). Many well-known swordsmiths are from one of the Goka-Den (main 5 schools, that is Yamashiro- Den, Bizen- Den, Soshu- Den, Yamato- Den, Mino- Den). Muramasa is not from Goka-Den but from Ise Province.
It is said that Muramasa was a student of Heian-Jo Nagayoshi (平安城長吉) of Yamashiro-Den. Muramasa has three generations through Mid Muromachi period. Since Muramasa lived through the Sengoku Period, his sword shows the characteristic of Sengoku period sword style that is Mino-Den characteristic with Soshu-Den characteristic added.
Muramasa from Sano Museum Catalogue (permission granted)
Mino-Den Characteristic of the Sengoku period that shows on this Tanto
Muramasa’s Tanto is often 10 inches ± half inches or so. Hirazukuri (平作り). Thin blade. Muramasa Tanto gives a sharp look. Nioi base with small Nie and Sunagashi (brushed sand like, the illustration below) appears. Boshi (Top part of Hamon) is Jizo (side view of the head shape). Tempered line has a wide area and narrow area, that is some area of tempered line is close to the edge of the blade and another area is a wide tempered line. See the illustration above. Hako-Midare (box like shape) and Gunome (line up beads like shape). O-Notare (large gentle waviness) is Muramasa’s characteristic. The pointed tempered line that is the typical Mino-Den characteristic (Sanbon Sugi) shows . Refer 24|Sengoku Period Sword(戦国時代）.
Sunagashi (Brushed sand-like trace. My drawing is exaggerated)