Katana Mumei (Unsigned) attributed as Muramasa school Signature Mumei (Unsigned) attributed as Muramasa school SuekotoJyo saku ranking The blade was polished Habaki gols foiled habaki Blade length 7095 cm or 2793 inches Sori 18 cm or 07 inches Width at the hamachi 277 cm or109 inches Muramasa (born before 1501), commonly known as Sengo Muramasa, was a sword smith who founded the Muramasa sword making school and lived during the Muromachi Period (14th to 16th century) in Kuwana, Ise Province , Japan (currently Kuwana, Mie )The Muramasa school continued into the late 1500's It's believed that Sengo Muramasa was a student of Heianjo Nagayoshi, a prominent Kyoto swordsmith known for spears and engravings ムラマサハイスクール4 Kuro ムラマサハイスクール