Dr. Ito's In-Depth Analysis of Mechanical Watches!! Vol. 51 - Luxury Watch Dial Manufacturing: The World of Grand Feu and Guilloché

This column, narrated from an engineer's perspective, focuses on mechanical watches. This 51st installment will discuss:

"Luxury Watch Dial Manufacturing: The World of Grand Feu and Guilloché"

This will be our topic.

When you look at a wristwatch, the first thing you notice is the dial. It's no exaggeration to say that the dial determines much of a watch's impression, even more so than the case or bracelet.

In recent years, unique dials made from natural materials have gained popularity. However, in the world of luxury watches, the dial is not just a mere component, but sometimes created with a level of craftsmanship akin to a work of art.

This time, we will discuss three representative techniques found in luxury watches:

・Grand Feu
・Hammer-tone
・Guilloché

Let's talk about these.

Grand Feu Enamel: A Dial That Never Fades

First up is the technique often called the king of dial craftsmanship: "Grand Feu Enamel."

Meaning "great fire" in French, it is created by firing glass-like enamel glaze in a high-temperature kiln at around 800°C.

The manufacturing process can be summarized simply as:

1. Apply enamel powder to a metal plate
2. Fire it in a kiln
3. Cool it down
4. Apply again
5. Fire again

This process is repeated many times.

Grand Feu enamel often cracks during firing, and the success rate is said to be quite low.

The greatest feature of "Grand Feu" is that it "retains its color for decades." Since it is glass, not paint, it has these qualities:

・Resistant to fading from UV light
・Virtually no aging
・Achieves deep transparency

For this reason, it is often adopted by classic brands like Patek Philippe and Breguet.

Hammer-tone: A Dial That Retains the Texture of Handcraftsmanship

Next, we introduce a recently popular technique: "Hammer-tone."

This is a decoration created by finely hammering the metal surface to create an uneven texture.

How is it made? Artisans use specialized tools to strike the metal thousands of times, very finely and uniformly. This creates a "subtle random pattern" on the surface.

The appeal of hammer-tone is:

1. Sparkles and reflects light
2. Changes appearance depending on the angle
3. Evokes the warmth of handcraftsmanship

Its charm lies in its organic texture, which cannot be achieved with machine processing.

In recent years, it has become increasingly common in independent brands and limited edition models.

Audemars Piguet's specialty, "frosted gold," is made using a similar technique and enjoys immense popularity.

Guilloché: Geometric Patterns Born from Machine and Craftsmanship

And the most famous is Guilloché – those delicate geometric patterns engraved on watch dials.

Guilloché on luxury watches is created using traditional lathes, where artisans turn a handle to engrave the patterns.

Common patterns include:

Clous de Paris

Soleil (Sunburst)

Barleycorn

and others.

This technique also conveys the warmth of handcraftsmanship and is a specialty of classic brands.

Summary

What did you think?

"Isn't a regular dial beautiful enough?"

That might be true. But luxury watches are not just practical items; they are also cultural artifacts (art).

The dial is the "face of the watch" and the first thing one looks at. That's why artisanal techniques like deep, beautiful enamel and handcrafted textures are used.

Luxury watch dials conceal an astonishing amount of skill and effort. These are not merely decorations, but the very essence of watch culture. I believe they are crucial elements that determine a brand's "status."

I hope this article provided useful information and sparked even a little interest in luxury watches! Also, if you have any questions, please feel free to ask us directly, and we will be sure to answer them thoroughly. We look forward to your visit and inquiries.

Stay tuned for the next installment! See you then!