Other certificates

Only The NBTHK issues certificates? Other than the NBTHK, there are some associates, appraisers, and shops issuing their own certificate but the NBTHK’s one is still the most popular. [...]

Forgery of the Japanese sword

Is your sword genuine or fake? Like other fine arts, there’re many deceptions in the world of the Japanese sword. The most well-known one is arguably the false signature [...]

NBTHK certificate ranking and criteria

What is the NBTHK? The NBTHK (short for Nihon Bijutsu Token Hozon Kyokai) was founded in February 1948 as an authorized foundation by the government with a mission to preserve the Japanese [...]

Nakago Appraisal

Why the Nakago is so important? Along with the sword shape, the sword characteristics, and the signature, You can get some ideas of the sword’s age and the maker from the NAKAGO(茎). The [...]


What is Sayagaki(鞘書き)? Sayagaki refers to the attribution or appraisal written on the SHIRASAYA(白鞘). In many cases, it mentions the swordsmith and the other inscriptions on the NAKAGO(茎), the [...]


What is Kuwana-Uchi(桑名打ち)? Kuwana-Uchi literally means “a sword made in the Kuwana city of Ise province“. In most cases, however, it refers to the fake swords made in Kuwana as many [...]


What is Honami(本阿弥)? Honami family is a family of sword appraisers and polishers, which have continued for generations. The family originally served the Ashikaga clan and polished the [...]