{"id":42548,"date":"2026-02-19T07:50:21","date_gmt":"2026-02-19T07:50:21","guid":{"rendered":"https:\/\/www.supeinnihonto.com\/?post_type=product&#038;p=42548"},"modified":"2026-02-19T08:11:37","modified_gmt":"2026-02-19T08:11:37","slug":"nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon","status":"publish","type":"product","link":"https:\/\/www.supeinnihonto.com\/it\/prodotto\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\/","title":{"rendered":"Nihonto Katana &#8220;Kobayashi Seijun&#8221; NBTHK Tokobetsu Hozon"},"content":{"rendered":"<p><span>ITEM DESCRIPTION:<\/span><\/p>\n<p>Comes with kimono or cotton bag. Comes with certificate of supein Nihonto. Comes with copy of Tokosusho. Comes with NBTHK Tokobetsu Hozon.<\/p>\n<h3 data-start=\"2094\" data-end=\"2115\"><strong data-start=\"2098\" data-end=\"2115\">Documentation<\/strong><\/h3>\n<ul data-start=\"3053\" data-end=\"3496\">\n<li data-start=\"3053\" data-end=\"3078\" style=\"list-style-type: none;\">\n<div class=\"TyagGW_tableContainer\">\n<h2 data-start=\"3878\" data-end=\"3943\">Certificate and registration<\/h2>\n<p data-start=\"3350\" data-end=\"3371\">Appraisal Certificate NBTHKTokobetsu Hozon<\/p>\n<p data-start=\"3373\" data-end=\"3415\">Title:<br data-start=\"3379\" data-end=\"3382\" \/>Ichit\u014d-mei Appraisal Certificate.<\/p>\n<p data-start=\"3417\" data-end=\"3486\">Main text:<br data-start=\"3427\" data-end=\"3430\" \/>Hokuetsu Shinj\u014d resident Kobayashi Seijun forged this.<\/p>\n<p data-start=\"3488\" data-end=\"3552\">Ansei 4 (1857), year of the Snake, second month, auspicious day.<\/p>\n<p data-start=\"3554\" data-end=\"3678\">After examination by this association, it has been determined to be a Tokubetsu Hozon T\u014dken and is hereby certified as such.<\/p>\n<p data-start=\"3680\" data-end=\"3714\">Dated February 21, Reiwa 7 (2025).<\/p>\n<p data-start=\"3716\" data-end=\"3814\">Public Interest Incorporated Foundation<br data-start=\"3755\" data-end=\"3758\" \/>The Society for the Preservation of Japanese Art Swords.<\/p>\n<p data-start=\"3816\" data-end=\"3899\">Length stated: 2 shaku 3 sun 5 bu (approx. 71.2 cm).<br data-start=\"3868\" data-end=\"3871\" \/>Certificate number: 1024065.<\/p>\n<hr data-start=\"3901\" data-end=\"3904\" \/>\n<p data-start=\"3906\" data-end=\"3936\">Registration Paper (Torokusho)<\/p>\n<p data-start=\"3938\" data-end=\"4154\">Osaka No. 61929.<br data-start=\"3954\" data-end=\"3957\" \/>Type: Katana.<br data-start=\"3970\" data-end=\"3973\" \/>Length: 71.8 cm.<br data-start=\"3989\" data-end=\"3992\" \/>Sori: 3.0 cm (registered measurement).<br data-start=\"4030\" data-end=\"4033\" \/>Signed: Hokuetsu Shinj\u014d j\u016b Kobayashi Seijun saku.<br data-start=\"4082\" data-end=\"4085\" \/>Registered December 15, 1970.<br data-start=\"4114\" data-end=\"4117\" \/>Osaka Prefectural Board of Education.<\/p>\n<hr data-start=\"4156\" data-end=\"4159\" \/>\n<p data-start=\"4161\" data-end=\"4199\"><strong>SMITH, SCHOOL AND HISTORICAL CONTEXT<\/strong><\/p>\n<p data-start=\"4201\" data-end=\"4419\">The mei clearly identifies the smith as Hokuetsu Shinj\u014d j\u016b Kobayashi Seijun, active in Echigo Province (Hokuetsu). Seijun is documented as the same individual known as Kobayashi Masaoki, working in the late Edo period.<\/p>\n<p data-start=\"4421\" data-end=\"4636\">Dated Ansei 4 (1857), the blade belongs to the closing phase of the Edo period, immediately preceding the Bakumatsu upheaval. During this era, many smiths sought refined workmanship inspired by classical traditions.<\/p>\n<p data-start=\"4638\" data-end=\"4720\">The Tokubetsu Hozon designation confirms recognized artistic and historical merit.<\/p>\n<hr data-start=\"4722\" data-end=\"4725\" \/>\n<p data-start=\"4727\" data-end=\"4763\"><strong>TECHNICAL DESCRIPTION OF THE BLADE<\/strong><\/p>\n<p data-start=\"4765\" data-end=\"4936\">Hamon<br data-start=\"4770\" data-end=\"4773\" \/>A well-defined suguha hamon runs consistently along the cutting edge, controlled and even, with subtle internal activity and a natural transition into the kissaki.<\/p>\n<p data-start=\"4938\" data-end=\"5065\">Jihada<br data-start=\"4944\" data-end=\"4947\" \/>Fine visible itame grain typical of late Shinshint\u014d production. The steel exhibits density and structural consistency.<\/p>\n<p data-start=\"5067\" data-end=\"5215\">Nakago<br data-start=\"5073\" data-end=\"5076\" \/>Ubu nakago with one mekugi-ana.<br data-start=\"5107\" data-end=\"5110\" \/>Stable dark patina consistent with age.<br data-start=\"5149\" data-end=\"5152\" \/>The mei is deeply and confidently cut, proportionally balanced.<\/p>\n<p data-start=\"5217\" data-end=\"5440\">Geometry<br data-start=\"5225\" data-end=\"5228\" \/>Nagasa approximately 71.8 cm.<br data-start=\"5257\" data-end=\"5260\" \/>Current measured sori approximately 2 cm.<br data-start=\"5344\" data-end=\"5347\" \/>Elegant and harmonious sugata.<br data-start=\"5377\" data-end=\"5380\" \/>Properly proportioned kissaki with smooth yokote transition.<\/p>\n<p data-start=\"5442\" data-end=\"5575\">Overall condition<br data-start=\"5459\" data-end=\"5462\" \/>Excellent structural preservation. The blade retains clear hamon definition and well-preserved surface structure.<\/p>\n<hr data-start=\"5577\" data-end=\"5580\" \/>\n<p data-start=\"5582\" data-end=\"5592\"><strong>MOUNTING<\/strong><\/p>\n<p data-start=\"5594\" data-end=\"5631\">Presented in custom-fitted shirasaya.<\/p>\n<p data-start=\"5633\" data-end=\"5746\" data-is-last-node=\"\" data-is-only-node=\"\">The shirasaya ensures optimal preservation conditions and emphasizes the intrinsic artistic quality of the blade.<\/p>\n<p data-start=\"3945\" data-end=\"3993\">\n<\/div>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>ITEM DESCRIPTION: Comes with kimono or cotton bag. Comes with certificate of supein Nihonto. Comes with copy of Tokosusho. Comes with NBTHK Tokobetsu Hozon. Documentation Certificate and registration Appraisal Certificate NBTHKTokobetsu Hozon Title:Ichit\u014d-mei Appraisal Certificate. Main text:Hokuetsu Shinj\u014d resident Kobayashi Seijun forged this. Ansei 4 (1857), year of the Snake, [&hellip;]<\/p>\n","protected":false},"featured_media":42619,"template":"","meta":{"jetpack_post_was_ever_published":false},"product_brand":[],"product_cat":[746,743],"product_tag":[754,755],"class_list":{"0":"post-42548","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-katana-tachi","7":"product_cat-nihonto","8":"product_tag-katana","9":"product_tag-nihonto","10":"product_shipping_class-swords","12":"first","13":"instock","14":"featured","15":"sold-individually","16":"shipping-taxable","17":"purchasable","18":"product-type-simple"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Nihonto Katana &quot;Kobayashi Seijun&quot; NBTHK Tokobetsu Hozon - Supein Nihonto<\/title>\n<meta name=\"description\" content=\"The blade is signed \u5099\u524d\u570b\u9577\u8239\u4f4f\u7950\u76db (Bizen no Kuni Osafune j\u016b Sukemori) and dated \u6587\u5316\u4e94\u5e74\u4e8c\u6708 (second month of Bunka 5, 1808), therefore Edo period. The certificate itself provides the key biographical note: Sukemori is stated to be the son of Ise no Kami Sukemori, and to have later adopted the name Shichibee Sukemori. The lineage\/work tradition is recorded as \u9577\u8239 (Osafune).\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.supeinnihonto.com\/it\/prodotto\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nihonto Katana &quot;Kobayashi Seijun&quot; NBTHK Tokobetsu Hozon - Supein Nihonto\" \/>\n<meta property=\"og:description\" content=\"The blade is signed \u5099\u524d\u570b\u9577\u8239\u4f4f\u7950\u76db (Bizen no Kuni Osafune j\u016b Sukemori) and dated \u6587\u5316\u4e94\u5e74\u4e8c\u6708 (second month of Bunka 5, 1808), therefore Edo period. The certificate itself provides the key biographical note: Sukemori is stated to be the son of Ise no Kami Sukemori, and to have later adopted the name Shichibee Sukemori. The lineage\/work tradition is recorded as \u9577\u8239 (Osafune).\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.supeinnihonto.com\/it\/prodotto\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\/\" \/>\n<meta property=\"og:site_name\" content=\"Supein Nihonto\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-19T08:11:37+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.supeinnihonto.com\/wp-content\/uploads\/2026\/02\/61929title-scaled.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"1431\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Tempo di lettura stimato\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minuto\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/prodotto\\\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\\\/\",\"url\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/prodotto\\\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\\\/\",\"name\":\"Nihonto Katana \\\"Kobayashi Seijun\\\" NBTHK Tokobetsu Hozon - Supein Nihonto\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/prodotto\\\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/prodotto\\\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/i0.wp.com\\\/www.supeinnihonto.com\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/61929title-scaled.jpg?fit=2560%2C1431&ssl=1\",\"datePublished\":\"2026-02-19T07:50:21+00:00\",\"dateModified\":\"2026-02-19T08:11:37+00:00\",\"description\":\"The blade is signed \u5099\u524d\u570b\u9577\u8239\u4f4f\u7950\u76db (Bizen no Kuni Osafune j\u016b Sukemori) and dated \u6587\u5316\u4e94\u5e74\u4e8c\u6708 (second month of Bunka 5, 1808), therefore Edo period. The certificate itself provides the key biographical note: Sukemori is stated to be the son of Ise no Kami Sukemori, and to have later adopted the name Shichibee Sukemori. The lineage\\\/work tradition is recorded as \u9577\u8239 (Osafune).\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/prodotto\\\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\\\/#breadcrumb\"},\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/prodotto\\\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"it-IT\",\"@id\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/prodotto\\\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\\\/#primaryimage\",\"url\":\"https:\\\/\\\/i0.wp.com\\\/www.supeinnihonto.com\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/61929title-scaled.jpg?fit=2560%2C1431&ssl=1\",\"contentUrl\":\"https:\\\/\\\/i0.wp.com\\\/www.supeinnihonto.com\\\/wp-content\\\/uploads\\\/2026\\\/02\\\/61929title-scaled.jpg?fit=2560%2C1431&ssl=1\",\"width\":2560,\"height\":1431,\"caption\":\"Nihonto Katana tokobetsu hozon Hokuetsu Shinjo jyu Kobayashi Seijun Kobayashi Masaoki1857 for sale\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/prodotto\\\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Portada\",\"item\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Shop\",\"item\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/shop\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Nihonto Katana &#8220;Kobayashi Seijun&#8221; NBTHK Tokobetsu Hozon\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/#website\",\"url\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/\",\"name\":\"Supein Nihonto\",\"description\":\"Authentic japanese Nihonto katana \",\"publisher\":{\"@id\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"it-IT\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/#organization\",\"name\":\"SupeinNihonto\",\"url\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"it-IT\",\"@id\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/www.supeinnihonto.com\\\/wp-content\\\/uploads\\\/2021\\\/11\\\/animation_Default_3szk0jcenoloop.gif\",\"contentUrl\":\"https:\\\/\\\/www.supeinnihonto.com\\\/wp-content\\\/uploads\\\/2021\\\/11\\\/animation_Default_3szk0jcenoloop.gif\",\"width\":750,\"height\":641,\"caption\":\"SupeinNihonto\"},\"image\":{\"@id\":\"https:\\\/\\\/www.supeinnihonto.com\\\/it\\\/#\\\/schema\\\/logo\\\/image\\\/\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Nihonto Katana \"Kobayashi Seijun\" NBTHK Tokobetsu Hozon - Supein Nihonto","description":"The blade is signed \u5099\u524d\u570b\u9577\u8239\u4f4f\u7950\u76db (Bizen no Kuni Osafune j\u016b Sukemori) and dated \u6587\u5316\u4e94\u5e74\u4e8c\u6708 (second month of Bunka 5, 1808), therefore Edo period. The certificate itself provides the key biographical note: Sukemori is stated to be the son of Ise no Kami Sukemori, and to have later adopted the name Shichibee Sukemori. The lineage\/work tradition is recorded as \u9577\u8239 (Osafune).","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/www.supeinnihonto.com\/it\/prodotto\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\/","og_locale":"it_IT","og_type":"article","og_title":"Nihonto Katana \"Kobayashi Seijun\" NBTHK Tokobetsu Hozon - Supein Nihonto","og_description":"The blade is signed \u5099\u524d\u570b\u9577\u8239\u4f4f\u7950\u76db (Bizen no Kuni Osafune j\u016b Sukemori) and dated \u6587\u5316\u4e94\u5e74\u4e8c\u6708 (second month of Bunka 5, 1808), therefore Edo period. The certificate itself provides the key biographical note: Sukemori is stated to be the son of Ise no Kami Sukemori, and to have later adopted the name Shichibee Sukemori. The lineage\/work tradition is recorded as \u9577\u8239 (Osafune).","og_url":"https:\/\/www.supeinnihonto.com\/it\/prodotto\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\/","og_site_name":"Supein Nihonto","article_modified_time":"2026-02-19T08:11:37+00:00","og_image":[{"width":2560,"height":1431,"url":"https:\/\/www.supeinnihonto.com\/wp-content\/uploads\/2026\/02\/61929title-scaled.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_misc":{"Tempo di lettura stimato":"2 minuto"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/www.supeinnihonto.com\/it\/prodotto\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\/","url":"https:\/\/www.supeinnihonto.com\/it\/prodotto\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\/","name":"Nihonto Katana \"Kobayashi Seijun\" NBTHK Tokobetsu Hozon - Supein Nihonto","isPartOf":{"@id":"https:\/\/www.supeinnihonto.com\/it\/#website"},"primaryImageOfPage":{"@id":"https:\/\/www.supeinnihonto.com\/it\/prodotto\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\/#primaryimage"},"image":{"@id":"https:\/\/www.supeinnihonto.com\/it\/prodotto\/nihonto-katana-kobayashi-seijun-nbthk-tokobetsu-hozon\/#primaryimage"},"thumbnailUrl":"https:\/\/i0.wp.com\/www.supeinnihonto.com\/wp-content\/uploads\/2026\/02\/61929title-scaled.jpg?fit=2560%2C1431&ssl=1","datePublished":"2026-02-19T07:50:21+00:00","dateModified":"2026-02-19T08:11:37+00:00","description":"The blade is signed \u5099\u524d\u570b\u9577\u8239\u4f4f\u7950\u76db (Bizen no Kuni Osafune j\u016b Sukemori) and dated \u6587\u5316\u4e94\u5e74\u4e8c\u6708 (second month of Bunka 5, 1808), therefore Edo period. 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Comes with certificate of supein Nihonto. Comes with copy of Tokosusho. Comes with NBTHK Tokobetsu Hozon. Documentation Certificate and registration Appraisal Certificate NBTHKTokobetsu Hozon Title:Ichit\u014d-mei Appraisal Certificate. Main text:Hokuetsu Shinj\u014d resident Kobayashi Seijun forged this. 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Comes with certificate of supein Nihonto. Comes with copy of Tokosusho. Comes with NBTHK Tokobetsu Hozon. 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