The Dials incorporate sunray and guilloche finishes, and therefore are usually guarded by scratch-resistant sapphire crystals. Connected to the scenarios are buttery-clean Barenia leather straps, typically in the color of the picking out. Declaring the winner on the race to construct the main automatic chronograph in 1969 is contentious business, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/