TiC Is often a method of incredibly difficult ceramic, and it can even be extra scratch-resistant than sapphire using a Mohs hardness rating approximately nine.five. The bezel is additionally topped with sapphire, giving just as much protection as feasible to your micro gas tubes that sort the markers. 1844: Adolphe https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/