Not only is the Atum Hamatic Moritz Grossmann's first automatic watch, it also revives an old-generation concept which uses a hammer, rather than an oscillating weight, to wind the mainspring barrel. So that we can fully appreciate the subtleties of this unusual system, which provides 72 hours of power reserve, there is a cut-out portion at the bottom of the dial. A clutch mechanism means the watch can be wound by wrist movement or manually. The time is precisely set by pulling out the crown to actuate the stop seconds. The Atum Hamatic's design looks to the aesthetic of the pocket watches that Moritz Grossmann, the man, was making in Glashütte in the nineteenth century, in particular the elongated Roman numerals and slender pear-tipped hands. The case is crafted from pink gold.