How can we polish metal to achieve a beautiful distortion-free finish? In the long history of watchmaking, various polishing techniques have been studied. Among them, I was particularly drawn to a processing technique called Zaratsu polishing. Zaratsu polishing is a processing technique that involves polishing a material by pressing it against a flat rotating plate coated with an abrasive to create a “uniformly smooth surface” and a beautiful mirror surface. For the base model of the design, I chose manufactured King Seiko creation created in the 1970s. This model, characterized by its simple and bold shape, still retains its brilliance after more than 50 years, thanks to its distortion-free mirror surfaces made possible by the Zaratsu polishing technique.

The different angles of each surface give the case and dial a beautiful shine. This perfection is the result of Seiko’s long-cultivated Zaratsu polishing technique.

In this project, while utilizing the Zaratsu polishing technique, I pursued an ideal watch form that I myself would find attractive. The most distinctive feature of the design is the form of the case, which is composed of numerous facets. The carefully polished mirror surfaces of the case reflect light in various directions, making them sparkle and shine. The dial is also surrounded by a series of three-dimensional ridges forming 60 surfaces that also function as minute markers. By giving a single shape a dual role of decoration and function, I aimed to create the ideal form of a watch.

The straight lines created by the meeting of surfaces at different angles also serve as highly visible minute markers.

The minute markers on the outer edge of the dial are created by carving out three-dimensional forms. The intent was to indicate each moment in the flow of time more precisely.

The designer’s idea of the ideal watch form is realized. The reflection of light from any angle gives off a beautiful radiance that brightly illuminates the hearts of those who wear the watch.

I repeated simulations many times, paying close attention to the balance of details. Please pay attention to the beauty of the light emitted from the case and dial. You will be able to feel the unique brilliance created by Zaratsu polishing. As a designer, I want to design watches that can make people feel a little more positive. With this in mind, I designed a watch that will continually brighten the hearts of those who wear it.

Polishing techniques have been refined over Seiko’s long history. The Radiant Time, which brings this technique to the modern age, radiates a timeless brilliance that transcends the ages.

Takuya Matsumoto 
Matsumoto joined Seiko in 2010. After designing Seiko brand watches for the global market, he engaged in the design of Astron. Today, he is mainly in charge of Presage and King Seiko.

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