The Dials incorporate sunray and guilloche finishes, and so are normally shielded by scratch-resistant sapphire crystals. Attached into the instances are buttery-smooth Barenia leather straps, normally in the colour of your picking out. Impressed by British pilot’s watches from the seventies, Hamilton’s Khaki Aviation has many of the rugged design https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/