The Historical legacy on the Moonwatch features a Hesalite crystal and an aluminum bezel with tachymeter scale. A. Lange & Söhne's watches are an embodiment of history and craftsmanship, inspired via the elegance of historic pocket watches I’ve had the Hesalite prior to and as “reliable” as it truly is, https://www.watchesworld.com/germanys-top-10-favourite-luxury-watches/