This is a beautiful katana from the well-known Gassan school, whose lineage traces back to the Kamakura period. It embodies the style and workmanship that have made their work so well respected and appreciated by collectors.

The Gassan name carries great prestige. Gassan Sadakazu was an esteemed craftsman with the rank of Imperial Court Artisans. Gassan Sadakatsu, his son, himself trained two Living National Treasures. Today, Gassan Sadatoshi continues this proud tradition, mesmerizing the world with his breathtaking creations from the forge.

The earliest part of the Gassan school is known as Ko-Gassan. This particular katana showcases the distinguishing features of the Gassan school, dating back to koto times. The ayasugi hada creates undulating curves that gracefully flow through the blade, intersecting with the hamon, showing the essence of the Gassan style.
In the koto times, individual smiths within the Gassan lineage often signed with the school name only, leading to the loss of many individual names over time. This katana does not bear a mei but is fully intact in length.

The sword expert Fujishiro bestowed upon the koto school a blanket rating of Chu-jo saku, signifying above-average workmanship. This katana has been given Hozon papers by the NBTHK, confirming its authenticity and quality. Maintaining its original state (ubu with two mekugi-ana), this sword serves as a representative piece of the Gassan school, and is a very desirable sword for any collection.