TiC Is a sort of very difficult ceramic, and it may even be more scratch-resistant than sapphire having a Mohs hardness rating as much as 9.5. The bezel can be topped with sapphire, offering just as much protection as is possible for the micro gasoline tubes that type the markers. https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/
5 Essential Elements For Understanding The complex world of chronometers
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