The Dials include sunray and guilloche finishes, and therefore are normally guarded by scratch-resistant sapphire crystals. Attached for the instances are buttery-clean Barenia leather straps, frequently in the colour of the picking out. Chronographs — with their bezels, scales and sub-dials — tend to be regarded as way too complex https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/