A very special and rare signed and dated tanto by Gassan Sadakatsu with original double presentation box, made in commemoration of the birth of Prince Akihito (First son of Emperor Hirohito, and Emperor from 1989 to 2019). Presentation box has hakogaki by Gassan Sadatsugu describing the blade and NBTHK Hozon.
Gassan Sadakatsu (貞勝) was born in Meiji two (明治, 1869) as the first son of Gassan Sadakazu (貞一) in Yariyamchi, Osaka. His real name was Gassan Eitarō (月山英太郎). He learned swordmaking under his father in the very early years of childhood. His skill developed and made many daisaku blades for his father. He succeeded to the head of the Osaka Gassan school after his father's death in 1918. Gassan Sadakatsu made swords primarily for the Emperor, the Royal families and the Imperial Household Ministry. These people commissioned swords for their own use as well as for giving away to high ranking officers of the Imperial Militrary.
The blade is in very nice polish housed in a shirasaya with gold foil habaki. The hamon is suguha and hada is ayasugi.