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Hairline finish.

It is a surface finish that attaches a very thin line linearly like a hair.
Once it has finished mirror finish, slide the case in a certain direction, and use sandpaper to make a line.
I tried this finish with free hand, but it was as difficult as I needed skilled skills
Since this process is inconspicuous even if fine scratches are attached to the surface, it is the most common watch surface finish. It is also called hairline processing, satin finishing.


表面に髪の毛のようにとても細いラインを直線的に付ける仕上げ。
一度、鏡面加工にした後に、ケースを一定方向に滑らせるように動かし、サンドペーパーを用いて、筋目を付ける加工を施す。
フリーハンドでこの仕上げを施したことがあるが、熟練の技が必要とされるぐらいなかなかに難しい。
細かいキズなどが付いても目立たないため、最も一般的な時計の表面仕上げである。筋目加工とも呼ばれる。

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