The Dials involve sunray and guilloche finishes, and are constantly shielded by scratch-resistant sapphire crystals. Connected into the instances are buttery-sleek Barenia leather straps, typically in the color of one's picking. Chronographs — with their bezels, scales and sub-dials — are sometimes considered too complex for formal obligation by diehards https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/