The subject of the invention is a muselet plate (1) defined by a metallic body (2) in the shape of a cap, having an internal face (3) and an external face (4). It is characterized in that said outer face (4) has a recess (5). The invention also relates to a muselet (13) comprising such a muselet plate (1), as well as an assembly comprising this same muselet (13) and a bottle stopper, one face of which has a recess of shape complementary to that of the recess. (5) formed in the outer face (4) of the muzzle plate (1) which said muzzle 13). Figure for the abstract: Fig. 1
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