To provide a watch in which, in case where a screw lock function has decreased, a part exchange around a crown is made possible while ensuring a waterproofness. To an outside winding stem pipe having a bridge portion and brazed to a case band there is passed an inside winding stem pipe having a male screw portion directed to an outside of the case band and a convex portion colliding against the bridge portion so as to be capable of being put in or out, the pipe is locked to the pipe by a lock means provided over both of the winging stem pipes, and the pipe is interposed between an attaching ring detachably meshing with the pipe and the convex portion, thereby positioning the pipe with respect to the former pipe in an axial direction. A crown is detachably meshed with the male screw portion of the pipe. It is characterized in that an inside waterproof gasket is interposed between the pipe and a crown cylinder portion, of the crown, inserted into the pipe, and an outside waterproof gasket is interposed between the outside and inside pipes.