Bottle stopper A stopper comprising a circular base from the perimeter of which a cylindrical wall extends perpendicularly to a circular open edge, having an inner face divided into a first portion, and a second smooth portion located near the open edge, the plug comprising a cutting line extending along the cylindrical wall and delimiting said first and second portions, said cutting line starting at a first end situated in a first angular position relative to an axis passing through the centers of the circular base and of the open edge and ending at the second end located in a second angular position, so that the angular extension of the cutting line is greater than 360º, and in which the height position of the second end on the cylindrical wall is different from the height position of the at the first end.
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