The Dials incorporate sunray and guilloche finishes, and so are generally secured by scratch-resistant sapphire crystals. Attached to the cases are buttery-smooth Barenia leather straps, typically in the color of the picking. Motivated by British pilot’s watches from the seventies, Hamilton’s Khaki Aviation has all of the rugged design you’d https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/