TiC Is a type of very difficult ceramic, and it may even be far more scratch-resistant than sapphire using a Mohs hardness ranking up to 9.5. The bezel can also be topped with sapphire, providing as much safety as feasible for the micro fuel tubes that form the markers. 1844: https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
The Rolex Watches Diaries
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