| 摘要 |
A sealed watchcase includes a middle-and-bezel having two concentric annular parts which are held one inside the other by means of friction. The internal part of these two parts is a rigid ring made of ordinary metal or plastic. The external part of these two parts is made of precious-metal and forms a thin casing covering at least the radially external surfaces of the rigid ring. A glass part is bonded inside an internal snap in the precious-metal casing. A back cover is held against a bottom flat surface of the middle-and-bezel by fixing screws which are screwed into the rigid ring and ensure, when tightened, clamping of a fitting ring inserted together with a watch movement into the opening of the rigid ring. Seals are compressed between the back cover and the middle-and-bezel. Only the back cover, the precious-metal casing and the glass form the external parts of the watchcase. As a result of this structure, it is possible to make ultra-flat precious-metal cases requiring only a minimum amount of precious metal.
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