This watch has a 40mm stainless steel case and a black leather strap. It consists of a fixed stainless steel bezel and screw-in crown. The surface is made of scratch-resistant sapphire crystal. At the same time, the watch is proud of its water resistance of 200 meters. In addition, the high-resolution black dial is composed of white hands and white Arabic numerals. The time indication function is completed by the white luminous hour and minute hands and the yellow second hand. Beside the dial, there is a tachymeter scale. Another feature is that the quartz dial has three sub-dials for timing functions. The date window is displayed at four o’clock. Using the precise Swiss quartz movement as the power, the Tissot 200 Chinese men’s quartz watch (T17152652) can ensure the most accurate and reliable timekeeping function.
In the song ‘Le Poinçonneur des Lilas’ by French singer Serge Gainsbourg, the Paris Metro ticket puncher’s mission throughout life Digging holes in tickets. Similarly, watchmakers need to punch holes, but this is not a stupid job. Shot-peening and grinding are the techniques for creating specific grainy matte surfaces.
Shot-peening is the continuous spraying of numerous small metal balls at high speed under full control, hitting the surface, thereby creating a residual compressive stress layer on the surface of the brass parts of the watch and the stainless steel (or gold) case. The number of such pits is large and the density is large. Like the craters on the moon and the sandy beaches along the coast, they have a uniform and uniform beauty. During shot peening, precise control of the appropriate degree is required. Excessive amounts will damage the strength of the part, and it will pay more than it pays. Most surface retouching processes tend to increase gloss and brightness. Otherwise, the rough surface will refract light and form a matte effect.
Blancpain 69F9 double-tracking pin splint is shot peened and plated with rose gold, showing a textured texture
Graining is more complicated. The surface is brushed with hard metal or other materials. The hole marks left by this process are wider, deeper and more obvious, but the process is not a ‘torture’ of watch parts. . During the process, as far as possible to ensure the uniformity of the texture in the pitch and depth, to achieve this requires a simple and precise process, especially the grinding (Graining) is different from the specific polishing, once the error is almost impossible to compensate.
Coperfus frosted almost all movement substrates and many other components
The requirements for the grinding process are extremely stringent, and only a few brands can master it. Cooperforth is one of the best. The brand applies frosting to almost all movement substrates and many other components, and of course, they prefer to call this process ‘frosting’. Another good at doing this article on watch parts is Breguet, especially on the brand Tradition series. It is first sand-blasted and then coated with a ferrous metal plating layer to further enhance the matte effect.
Breguet Tradition Series 7097 watch, the bridge and bottom plate are sandblasted and coated with black metal plating
In order to ensure the true effect of the Graining process, most of the brands have continued the watchmaking traditions of the 18th and 19th centuries. These tools are, of course, not automatic, and they now look quite primitive. For a movement component with a wide surface like a substrate, even if it is meticulous, it is difficult to achieve a perfect and uniform frosting effect with meticulous work. In contrast, it may be easier to create a definite effect with mechanical peening. In fact, no matter what scheme is used, Graining will be a complex and rare retouching process.