TiC Can be a kind of really really hard ceramic, and it can even be more scratch-resistant than sapphire with a Mohs hardness rating up to 9.5. The bezel is additionally topped with sapphire, supplying as much security as is possible on the micro fuel tubes that form the markers. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
Brands That manufacture chronometer watches - An Overview
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