N.B.T.H.K. (Nihon Bijutsu Token Hozon Kai) The N.B.T.H.K. (Nihon Bijutsu Token Hozon Kai) was founded in 1948 and is commonly recognized by collectors. They operate the Japanese Sword Museum in Tokyo. The NBTHK shinsa are held only in Japan. The names of their origami have changed over time. The N.B.T.H.K. issued the following types of origami starting in the 1950's. KICHO (white papers) - "Important Work" TOKUBETSU KICHO (green papers) - "Extraordinary Work" KOSHU TOKUBETSU KICHO (blue papers) - "Special Extraordinary Work JUYO TOKEN - "Very Important Work" TOKUBETSU JUYO - "Extraordinarily Important Work" This ranking scale was changed in the 1980's. The current system of origami includes the following types: HOZON - "Worthy of Preservation" TOKUBETSU HOZON - "Extraordinarily Worthy of Preservation" JUYO TOKEN - "Very Important Work" TOKUBETSU JUYO -
This is an interesting topic with regards to NBTHK paper levels and their effect on values from the Nihonto forum which I would like to share: Source: http://www.militaria.co.za/nmb/topic/12048-paper-levels-and-their-effect-on-value/page-2?hl=%20ryumon%20%20nobuyoshi In summary: Some years ago when the Fittings Museum collection was being auctioned at Christie's Darcy went to New York to look at the swords and the sword was attributed to Senjuin by the fittings museum but had no other papers and he bought it thinking it would attribute to another smith. http://www.christies... ... 400c019579 GBP 21,510 + 5378 (25% buyers premium) = GBP 26,999 (US$35,000 ~ 38000 depending on exchange rate) After sending it in for Shinsa and i t papered to Ryumon Nobuyoshi. Now, potential buyers who went out and sought opinions were told that the price of the sword was "too high" because it was "only Tokubetsu Hozon." People were assessing the sword by the
The Yamato Hosho Tradition from Kamakura till the Present by Han Bing Siong Traditionally sword students distinguish five different major styles in Japanese swords according to the provinces. Some like Nagayama Kokan sensei, say there are six styles the Shinto being the sixth. Peculiarly, many Japanese sources in specifying the Goka Den first refer to the Yamashiro den, then to the Yamato den. Bizen den, Soshu den and Mino den in this sequence. Those sources, however, are unanymous as regards the Kogarasu Maru by Amakuni, presently in the Imperial collection, being the oldest curved Japanese sword. They are also unanymous on the point that Amakuni was a swordsmith of Yamato province. So why mentioning Yamashiro first rather than Yamato ? Moreover, as the book Shosoin no Token (p.xiii) points out the Yamashiro den must have its origin in Yamato, because swords of sanjo Munechika and Awataguchi Kuniyoshi, both prominent early swordsmiths of Yamashiro province, have niju ba. Nijuba
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