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Blancpain

I can't find a picture...

 

...so I'll try to describe it. The bezel spring is a flat spring a bit like a thin washer. The washer has raised tabs that bite into serations on the underside of the bezel. The serations are angled such that the bezel can only rotate one way. If rotated anticlockwise, the bezel serations ride over the tabs. If clockwise, the tabs bite the serations and stop rotation.

These tabs have a history of breaking on a lot of watches, not just BPs, they're brittle and under reasonable stress. If the material is too hard, they may be even more brittle; if the tabs are badly stamped, there may be stress-raisers; if the material is not sufficiently corrosion resistant, the stressed tabs will weaken, water will encourage this.

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