{"id":30307,"date":"2026-02-19T10:10:36","date_gmt":"2026-02-19T01:10:36","guid":{"rendered":"https:\/\/sword-auction.com\/product\/30307\/as15403-%e5%88%80%ef%bc%9a%e6%96%bc%e6%b1%9f%e5%ba%9c%e9%95%b7%e5%af%bf%e6%96%89%e7%b6%b1%e4%bf%8a-%e9%95%b7%e9%81%8b%e6%96%89%e6%98%af%e4%bf%8a-%e4%bf%9d%e5%ad%98%e5%88%80%e5%89%a3-2\/"},"modified":"2026-02-19T10:11:05","modified_gmt":"2026-02-19T01:11:05","slug":"as15403-%e5%88%80%ef%bc%9a%e6%96%bc%e6%b1%9f%e5%ba%9c%e9%95%b7%e5%af%bf%e6%96%89%e7%b6%b1%e4%bf%8a-%e9%95%b7%e9%81%8b%e6%96%89%e6%98%af%e4%bf%8a-%e4%bf%9d%e5%ad%98%e5%88%80%e5%89%a3-2","status":"publish","type":"product","link":"https:\/\/sword-auction.com\/en\/product\/30307\/as15403-%e5%88%80%ef%bc%9a%e6%96%bc%e6%b1%9f%e5%ba%9c%e9%95%b7%e5%af%bf%e6%96%89%e7%b6%b1%e4%bf%8a-%e9%95%b7%e9%81%8b%e6%96%89%e6%98%af%e4%bf%8a-%e4%bf%9d%e5%ad%98%e5%88%80%e5%89%a3-2\/","title":{"rendered":"AS15403 Oite Koufu Chojyusai Tsunatoshi Chounsai Koretoshi"},"content":{"rendered":"<p>Order number : AS15403<\/p>\n<p>Katana in Shirasaya (NBTHK Hozon paper) (Gassaku Katana : collaborate\u3000Tsunatoshi and his son Koretoshi)<\/p>\n<p>Signature : Oite Koufu Chojyusai Tsunatoshi<br \/>\nChounsai Koretoshi Bunkyu 1 nen 8 gatsu Kichijitsu<\/p>\n<p>(We divide 4 sections for each sword as Saijyo saku, Jyojyo saku Jyo saku and regular saku)<br \/>\nThis Chojyusai Tsunatoshi Gassaku sword belongs to Jyo-saku ranking.<\/p>\n<p>Shinshinto : Jyosaku ranking : Musashi province.<br \/>\nThe blade was polished.<br \/>\nHabaki : Gold foiled single habaki.<br \/>\nBlade length : 71.0 cm or 27.95 inches.<br \/>\nSori : 2.0 cm or 0.78 inches.<br \/>\nMekugi : 3<br \/>\nWidth at the hamachi : 3.28 cm or 1.29 inches.<br \/>\nWidth at the Kissaki : 2.29 cm or 0.90 inches.<br \/>\nKasane : 0.72 cm or 0.28 inches.<br \/>\nEra : Late Edo period. Around Bunkyu era. (August Lacky day 1861)<br \/>\nShape : The blade is wide and thick with suitable sori and long kissaki nice looking shape.<br \/>\nJitetsu : Koitame had well grained with jinie attach.<br \/>\nHamon : Niedeki suguha and noter mixed with Kuichigai ha, and small ash double hamon. Boshi is round shape.<\/p>\n<p>Special feature : Chounsai Tsunatoshi the First forged this katana at Edo in 1846.<br \/>\nBorn Kato Hachiro in Dewa province, present Yamagata pref.<br \/>\nAs the Third son of Izumi (No) Kami Kunihide in 1798, learned under Suishinshi Masahide.<br \/>\nKato Tsunahide, known as its excellent Toran-ba hamon was Tsunatoshi&#8217;s elder brother.<br \/>\nTsunehide moved to Osaka from Edo and learned under Suzuki Harukuni.<br \/>\nAfter that Tsunahide went to Kyushu Island and forged sword at Kumamoto.<br \/>\nAround 1823, he lived a house of the Uesugi family at Azabu in Edo.<br \/>\nHe passed away in 1863, aged 66.<br \/>\nThe sword looks Yamato den style suguha hamon.<br \/>\nIt is very rear collaborate\u3000Tsunatoshi and his son Koretoshi.<\/p>\n<p>Historical background : Bunkyu Gannen(1st year) Russian battle ship occupied Tsushima Japanese territory.<br \/>\nBunkyu 2nd January Bakufu chief councilor Ando Nobumasa was attacked by mainly 6 Mito samurai while moving with 50 members of the guards.<br \/>\nHe was escaped to the Edo castle with some undergoing trauma\u3000and 6 members were killed by the guards.<\/p>\n<p>This picture is the front of the Sakurada mon.(Excerpt from Wikipedia)<\/p>\n<p>NBTHK Hozon paper<br \/>\nAoi Art estimation paper : whole Oshigata.<\/p>\n<p><a href=\"http:\/\/www.aoijapan.com\/img\/sword\/2015\/15403-2.jpg\"><img decoding=\"async\" src=\"http:\/\/www.aoijapan.com\/img\/sword\/2015\/15403-2.jpg\" alt=\"\" width=\"30%\" height=\"30%\" \/><\/a> <a href=\"http:\/\/www.aoijapan.com\/img\/sword\/2015\/15403-3.jpg\"><img decoding=\"async\" src=\"http:\/\/www.aoijapan.com\/img\/sword\/2015\/15403-3.jpg\" alt=\"\" width=\"30%\" height=\"30%\" \/><\/a> <a href=\"http:\/\/www.aoijapan.com\/img\/sword\/2015\/15403-4.jpg\"><img decoding=\"async\" src=\"http:\/\/www.aoijapan.com\/img\/sword\/2015\/15403-4.jpg\" alt=\"\" width=\"30%\" height=\"30%\" \/><\/a><br \/>\n<a href=\"http:\/\/www.aoijapan.com\/img\/sword\/2015\/15403paper-1.jpg\"><img decoding=\"async\" src=\"http:\/\/www.aoijapan.com\/img\/sword\/2015\/15403paper-1.jpg\" alt=\"\" width=\"50%\" height=\"50%\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Order number : AS15403 Katana in Shirasaya (NBTHK Hozon paper) (Gassaku Katana : collaborate\u3000Tsunatoshi and his son Koretoshi) Signature : Oite Koufu Chojyusai Tsunatoshi Chounsai Koretoshi Bunkyu 1 nen 8 gatsu Kichijitsu (We divide 4 sections for each sword as Saijyo saku, Jyojyo saku Jyo saku and regular saku) This Chojyusai Tsunatoshi Gassaku sword belongs [&#8230;]\n","protected":false},"featured_media":0,"template":"","meta":[],"class_list":["post-30307","product","type-product","status-publish","hentry","product_cat-katana-en","product_cat-sword-en"],"_links":{"self":[{"href":"https:\/\/sword-auction.com\/en\/wp-json\/wp\/v2\/product\/30307","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sword-auction.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/sword-auction.com\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:attachment":[{"href":"https:\/\/sword-auction.com\/en\/wp-json\/wp\/v2\/media?parent=30307"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}