Timepiece with an interchangeable bezel

The bezel ( 1 ) is interchangeable via a bayonet device. The shoulder ( 11 ) of the middle part ( 12 ) is provided with a circular groove ( 14 ) and at least two sinks ( 15 ) opening out partially into said groove ( 14 ). The bezel ( 1 ) includes at least two feet ( 2 ) positioned to engage in the sinks ( 15 ), said feet ( 2 ) each including a notch ( 4 ) open radially at the emergence of the sinks ( 15 ). A locking ring ( 20 ) provided with an outer member ( 21 ) for rotational manipulation, is positioned in the groove ( 14 ), one edge ( 23 ) of said ring ( 20 ) having a substantially equal thickness to the aperture of the notches ( 4 ) and including recesses ( 24 ) for the feet ( 2 ) to pass and the other edge ( 25 ) including a gorge ( 26 ) facing a gorge ( 16 ) of the middle part ( 12 ), the two gorges ( 16; 26 ) housing a click spring ( 30 ) of the ring ( 20 ).