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. [...]

Hamon and Durability

Some collectors have the impression that the HAMON(刃文) is closely related to the cutting ability but it’s not. If anything the Hamon has something to do with the durability. The hardened [...]

Shape of Tanto : Periodical Comparison

The Tanto(短刀) originated at some time from the end of the Heian to the early Kamakura period. Unlike the shape of Katana and Tachi, the shape of Tanto hadn’t changed dramatically because it [...]

Blood Groove?

Why is the groove of some swords painted with red lacquer? You may notice that a BOHI(棒樋) of some swords are often lacquered with red. As red is the color of blood, people tend to assume that a [...]

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 [...]

How old is your sword?

Need help identifying the age of your sword? It’s really difficult to guess the sword’s age when your sword is unsigned and you don’t have any certificate with it. This [...]

List of Toriji for each school

The Toriji indicates which school the smith belonged to. All the smiths of the school shared one Kanji character called the Toriji (通字) within their smith name. The Toriji usually originates from [...]