This maker code encompasses two distinct smiths named Masashige. Sengo Masashige (正重) of Province was, together with Masazane (正真), a renowned disciple of the first-generation Muramasa. Active in the late period, his manner closely resembles that of his master. Tegarayama Masashige (正繁), commonly known as Chōshichi and using the art name Tankasai, was a swordsmith of Himeji in Harima Province and a later descendant of the first Yamato no Daijō Ujishige. He was the younger brother of the third-generation Tegarayama Ujishige, first succeeding to the name of the fourth-generation Ujishige before changing his name to Masashige. In Tenmei 8 (1788) he became a retained smith of Matsudaira Sadanobu, lord of Shirakawa in Ōshū, moved to , and in Kyōwa 3 (1803) received the honorary title no Kami. In his later years he was granted by his lord the two characters "Shinmyō," which he is said to have inscribed only on works with which he was particularly satisfied.
Sengo Masashige's forging shows mixed with and , with a tendency toward (standing grain) that the consistently identifies as the primary distinction from Muramasa: "compared with Muramasa, Masashige tends to show stronger in both and , and overall there are many works whose forging appears somewhat , giving an impression of rustic vigor." His encompasses with -like elements, angular peaks, and pointed forms, with the temper on both sides tending toward correspondence. The adheres vigorously with and , and the is characteristically deeply tempered with a -like flavor. His shares Muramasa's distinctive form, "however, whereas Muramasa's tends toward angularity, here the noteworthy point is the emphatically rounded form with ample flesh." Tegarayama Masashige, by contrast, "generally held Tsuda no Kami Sukehiro in special esteem," and many of his works are superior examples of the tōran-style large . His forging presents densely compacted with fine, thickly adhering and abundant , and the steel is clear. The begins with before developing into billowing tōran-midare with deep and evenly thick . He also produced works in shallow and was himself an accomplished carver of .
Sengo Masashige is praised for works "filled with commanding vigor" that display "a vigorous and assertive spirit" unmistakable in the manner of the Sengo group. Tegarayama Masashige is recognized as "highly skilled," with his tōran-midare described as evoking "surging waves striking the shore" in which "the irregular pattern remains orderly and does not collapse." Both smiths, separated by roughly three centuries, produced works that the identifies as fully demonstrating their respective capabilities -- the one in the bold, -rich idiom of the Sengo lineage, the other in the refined, luminous tradition of revivalism.