The Dials incorporate sunray and guilloche finishes, and are normally safeguarded by scratch-resistant sapphire crystals. Hooked up on the instances are buttery-easy Barenia leather straps, often in the colour of one's choosing. Declaring the winner of the race to develop the 1st computerized chronograph in 1969 is contentious business enterprise, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/