It's a domed acrylic crystal deal with, leather strap, and a light-weight Create that tends to make this look at cozy put on each day. Remember: Acrylic crystal is just not as scratch-resistant as sapphire or mineral crystal; the leather-based band may demonstrate put on speedier than predicted. William’s charting, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/