In the Kamakura period (1185-1333), samurai liked the dark indigo color called "katsu-iro (褐色)". The origin of the color's name is that the character for "Katsu（勝つ）" was applied to it to make it a lucky color. It is a color closely associated with victory.

This color represents the eastern sky, which is illuminated by the moonlight as the moon rises.

This color is also used as a seasonal word in haiku and has a sense of tranquility and literary elegance.

Tango is the largest silk weaving center in Japan.

The unique climate, with humid winds called “uranishi” blowing from autumn to winter was ideal for weaving raw silk, which is easily broken by drying.

Tango crepe has been used for luxurious kimonos since ancient times and is characterized by its uneven crease texture, which is resistant to wrinkles and has a supple and soft texture.

The crease of the crepe is woven with threads that are strongly twisted about 3,000 times per meter. When cleansed, the thread shrinks, the twists are reverted, and the resulting kinks are used to create the crease. The creases of crepe are created by alternately weaving right and left twisted threads.

The dial inherits the Japanese minimalism and simplism. It is decorated with the Japanese traditional technique of "Kintsugi".

The gold lines are inspired by "Amanohashidate" in Tango, Kyoto, which is one of the three most scenic spots in Japan. It also appears in Japanese mythology.