It's a domed acrylic crystal confront, leather-based strap, and a light-weight Establish that helps make this look at relaxed dress in during the day. Remember: Acrylic crystal isn't as scratch-resistant as sapphire or mineral crystal; the leather-based band might show use quicker than expected. William’s charting, aided from the H4, https://www.watchesworld.com/understanding-the-complex-world-of-chronometers/