Iron Tsuba Carved Namu Myōhō Renge Kyō - Glory to the Mystic Law of the Lotus Sutra
Iron tsuba with carved text on the side. The text reads "Namu Myōhō Rengekyō". There are few translations of this there including "Devotion to the Mystic Law of the Lotus Sutra" or "Glory to the Dharma of the Lotus Sutra". Those words are chanted by the Nichiren Buddhist. There are plany more information about it available online. Here is a link to youtube video with the chant.