It's a domed acrylic crystal experience, leather strap, and a light-weight Establish that helps make this enjoy cozy wear during the day. Have in mind: Acrylic crystal is just not as scratch-resistant as sapphire or mineral crystal; the leather-based band may well present dress in quicker than predicted. William’s charting, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/