A. Lange & Sohne is a trademark of premier German watchmaking company Lange Uhren GmbH. Its watches rank among the finest in the world and sell in the same general price range as watches made by such top tier Swiss firms as Patek Philippe and Vacheron Constantin. Lange was founded in 1845 by Ferdinand Adolph Lange in the little town of Glashutte, near Dresden in the state of Saxony. In 1948, the postwar Soviet administration expropriated the company’s property, and the lange brand ceased to exist. But in 1990, after the collapse of the East German communist government, Adolph Lange’s great-grandson, Walter Lange, restored the company with help from a family of Swiss watch manufacturers including IWC. More recently, on march 15,2007, the company unveiled the culmination of a multi-year effort to produce the first wearable mechanical watch with a 31-day power reserve: that is, a watch that need be wound only once per month (with a special key). To guarantee the power reserve for with a 31-day power reserve: that is, a watch that need be wound only once per month (with a special key) Lange watches tend to have a highly distinctive appearance.