Kozuka with Plum Tree in Morning Sun Design, Signed Nakagawa Issho Toun Kin Saku Kore

Nakagawa Issho was the second son of Nakagawa Katsutsugu, a retained artisan (kakae-ko) of the Matsudaira family, lords of the Tsuyama domain in Mimasaka Province. His real name was Nakagawa Katsuzane, and his common name (tsusho) was Naojiro. At the age of twenty-one he entered the workshop of Goto Ichijo in Kyoto, and by twenty-five -- as evidenced by extant dated works -- he had already been granted the character "Ichi" by Ichijo and styled himself "Ikkatsu." During the Ansei era (1854-1860) he returned to Tsuyama; however, the Nakagawa house was ultimately succeeded by his youngest brother Katsutaka, and Issho returned to Edo in Man'en 1 (1860). Two years later, in Bunkyu 2 (1862), he changed "Ikkatsu" to "Issho." Traditionally counted among Ichijo's celebrated "Five Tigers" (Goko), he died in Meiji 9 (1876) at the age of forty-eight.

Issho's technical vocabulary encompasses the full range of the Ichijo school's metalworking tradition, deployed with what the NBTHK consistently characterizes as "assured technical skill." His mitokoromono demonstrate extremely fine nanako -- the refined "silk nanako" (kinu-nanako)[[c:1]] -- over shakudo grounds, embellished with graceful, minute takabori enriched by vivid iroe in gold and hi-irodo (scarlet copper). In his oborogin ground pieces, he renders dense, sumptuous motifs through takabori with iroe and kin-sunago zogan, "achieving a rich pictorial effect while maintaining crisp definition in the carving." His command of kosuki-bori and kebori is described as wielding chisels "with complete freedom," further employing among hira-zogan such refined techniques as pale, subdued keshi-zogan and sunago-zogan to convey what the NBTHK terms "a courtly and elegant taste." His rounded-relief menuki -- "a refinement characteristic of the Ichijo line" -- are carved with exceptionally fine technique.

The NBTHK positions Issho as one of the foremost pupils in the lineage of Goto Ichijo, a craftsman whose unified, fully matching sets of fittings represent the highest standard of coordinated metalwork in the late Edo and early Meiji periods. His productions consistently demonstrate the capacity to unify entire mounting programs -- from scabbard lacquer to hilt furnishings -- into works where "every aspect is imbued with a luxurious and splendid taste." The workmanship across his complete koshirae is repeatedly praised as executed "with exceptional care and meticulousness throughout," reflecting a mastery that places him securely among the principal inheritors of the Ichijo tradition.