Osafune Hidemitsu is recorded in the meikan as a lineage of Bizen smiths bearing the same name across four generations, beginning with a first generation placed in the Kenmu era and continuing through the Ōan, Shitoku, and Ōei eras into the early Muromachi period. However, as the NBTHK consistently observes, strict generation-by-generation differentiation remains a matter that must await further research. Hidemitsu belongs to the Koreha branch of the Osafune school and is regarded as a representative smith of the group known as ko-sori-mono — makers of "small-curvature" blades active in the late Nanbokuchō period who stand apart from the Kanemitsu lineage and from Chōgi, Motoshige, and the Ōmiya group. Among the Koreha school smiths, Hidemitsu is recognized as one of the most accomplished. At least one generation held the official title Saemon no Jō, as attested by signed works bearing the full inscription Bishū Osafune Saemon no Jō Hidemitsu. Extant dated works span roughly from Ōan through Shitoku and into Meitoku, providing valuable reference material for the chronology of late Nanbokuchō Bizen production.

Hidemitsu's jitetsu characteristically presents itame-hada mixed with mokume, forged tightly, with fine ji-nie adhering and chikei entering well. Various forms of utsuri appear — suguha-utsuri, bō-utsuri, and midare-utsuri — standing out distinctly in the ground. The hamon takes ko-gunome as a principal element, frequently mixed with angular forms, togariba, koshi-biraki gunome, and ko-chōji, sometimes showing a reverse inclination described as saka-gakari — a manner closely resembling that of the neighboring Aoe school. The temperline overall tends toward kozumi, a slightly subdued quality that the NBTHK identifies as a conspicuous characteristic shared across the ko-sori-mono category. The temper is predominantly nioi-based with ko-nie attaching, and fine sunagashi and kinsuji appear within. Hidemitsu also produced works in purely straight temper — naka-suguha with slight ko-ashi — which are regarded as documentary-valuable materials for understanding the working range of this school and this smith. Additionally, certain works show the Yoshii-mono tendency of aligning small ko-gunome in a uniform manner, further demonstrating the breadth of Hidemitsu's repertoire. The bōshi varies between sugu with ko-maru turnback, midare-komi ending in a pointed tip, and forms showing hakikake, with turnbacks generally kept short.

Across the designated corpus, the NBTHK consistently highlights the brightness and clarity of the nioiguchi in both ji and ha as the foremost attraction of Hidemitsu's work, describing it as healthy, bright, and vividly clear. Works in sound condition are praised as kenzen — well-preserved blades in which the forging is well-refined and delicate. The dated inscriptions that survive on numerous pieces are repeatedly characterized as excellent reference material and valuable source material for understanding late Nanbokuchō Bizen production. The open-based gunome found in certain works is noted as already suggesting an anticipation of the stylistic approach of Ōei-period Bizen, positioning Hidemitsu at a transitional moment within the tradition. While the NBTHK acknowledges that the workmanship of the ko-sori-mono group is generally considered not to reach the level of the Kanemitsu faction and similar lines, Hidemitsu's finest examples are singled out as outstanding among this smith's works — blades whose earnest, straightforward craftsmanship and luminous nioiguchi secure his standing as the leading figure of the ko-sori-mono tradition.

Osafune Hidemitsu is recorded in the meikan as a lineage of Bizen smiths bearing the same name across four generations, beginning with a first generation placed in the Kenmu era and continuing through the Ōan, Shitoku, and Ōei eras into the early Muromachi period. However, as the NBTHK consistently observes, strict generation-by-generation differentiation remains a matter that must await further research. Hidemitsu belongs to the Koreha branch of the Osafune school and is regarded as a representative smith of the group known as ko-sori-mono — makers of "small-curvature" blades active in the late Nanbokuchō period who stand apart from the Kanemitsu lineage and from Chōgi, Motoshige, and the Ōmiya group. Among the Koreha school smiths, Hidemitsu is recognized as one of the most accomplished. At least one generation held the official title Saemon no Jō, as attested by signed works bearing the full inscription Bishū Osafune Saemon no Jō Hidemitsu. Extant dated works span roughly from Ōan through Shitoku and into Meitoku, providing valuable reference material for the chronology of late Nanbokuchō Bizen production.

Hidemitsu's jitetsu characteristically presents itame-hada mixed with mokume, forged tightly, with fine ji-nie adhering and chikei entering well. Various forms of utsuri appear — suguha-utsuri, bō-utsuri, and midare-utsuri — standing out distinctly in the ground. The hamon takes ko-gunome as a principal element, frequently mixed with angular forms, togariba, koshi-biraki gunome, and ko-chōji, sometimes showing a reverse inclination described as saka-gakari — a manner closely resembling that of the neighboring Aoe school. The temperline overall tends toward kozumi, a slightly subdued quality that the NBTHK identifies as a conspicuous characteristic shared across the ko-sori-mono category. The temper is predominantly nioi-based with ko-nie attaching, and fine sunagashi and kinsuji appear within. Hidemitsu also produced works in purely straight temper — naka-suguha with slight ko-ashi — which are regarded as documentary-valuable materials for understanding the working range of this school and this smith. Additionally, certain works show the Yoshii-mono tendency of aligning small ko-gunome in a uniform manner, further demonstrating the breadth of Hidemitsu's repertoire. The bōshi varies between sugu with ko-maru turnback, midare-komi ending in a pointed tip, and forms showing hakikake, with turnbacks generally kept short.

Across the designated corpus, the NBTHK consistently highlights the brightness and clarity of the nioiguchi in both ji and ha as the foremost attraction of Hidemitsu's work, describing it as healthy, bright, and vividly clear. Works in sound condition are praised as kenzen — well-preserved blades in which the forging is well-refined and delicate. The dated inscriptions that survive on numerous pieces are repeatedly characterized as excellent reference material and valuable source material for understanding late Nanbokuchō Bizen production. The open-based gunome found in certain works is noted as already suggesting an anticipation of the stylistic approach of Ōei-period Bizen, positioning Hidemitsu at a transitional moment within the tradition. While the NBTHK acknowledges that the workmanship of the ko-sori-mono group is generally considered not to reach the level of the Kanemitsu faction and similar lines, Hidemitsu's finest examples are singled out as outstanding among this smith's works — blades whose earnest, straightforward craftsmanship and luminous nioiguchi secure his standing as the leading figure of the ko-sori-mono tradition.