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Primarily, crystal deals with the problem of the optimum adaptation to thin wrists. The binding of the bracelet is not as usual to horns firmly linked with the case. Instead it is mounted with customary pencils in two movable braces. These two braces are attached to the watch case at the middle axis. A perfect adaptation to the wrist is reached by the trick around the middle axis. On the left side a leadership bolt is mounted. The crown is found on the opposite side as usual. It is situated in a leadership shell for the braces and functions following the push-push principle and in the neutral state, concludes form-conclusively to the outwards