The controversy between Lange and Söhne over who is authentic has always been a topic of interest for cousins.
 
After the bombing of Dresden in 1945, many watchmakers in Glashütte fled to West Germany, including Walter Lange, an apprentice who had just graduated from a watchmaking school, and it was not until 1976 that he returned to Glashütte and risked some of the drawings from his uncle Otto's belongings, which became the basis for Walter Lange to relaunch the Lange brand in 1990. After the end of World War II, the East German government brought together watchmakers in the town of Glashütte to form the Glashutter Uhrenbetriebe (GUB). It can be said that the century-old Glashütte watchmaking has been preserved in the town of Glashütte in its entirety in terms of talents, equipment and materials, and was finally merged into the GUB to continue to this day.
 
In 1994, The Glashütte Uhrenbetries GmbH was acquired by a consortium as a privately owned company under the product trademark "Glashütte Original", and in 2000 it was acquired by the Swatch Group. Glashütte Original is a direct successor to the GUB's history, from the case to the movement, and more importantly, in addition to the German watchmaking features, such as the three-quarter bridge, the outsize date, the engraved gooseneck fine-tuning, the blued screws, the gold chatons, the sun-brushed wheel, and the Glashütte traditional flying tourbillon, its innovative ability should not be underestimated. For the gooseneck fine-tuning technology, which is the hallmark of German watchmaking, Glashütte originally invented the rounded balance spring clip, which solved the problem of the impact of hairspring deformation on isochronism for hundreds of years, and the patented bidirectional different deceleration greatly improved the efficiency of automatic winding.
 
Glashütte Original is the largest patent filer in recent years for Grand Complication perpetual calendar technology, producing the world's only countdown chronograph. The tourbillons are also faithful to the Glashütte tradition of flying tourbillons, which are characterized by their large size, high and floating rotation, and slender outer cage that does not obstruct the view.
 
In terms of product lines, Glashütte Original covers a wide range of prices from steel watches to precious metal watches, from simple to complex. A. Lange & Söhne only produces watches in precious metals, and the annual production of around 5,000 pieces makes it much less difficult to control than Glashütte Original. As an entry-level model, the Senator series is elegant and atmospheric; 1960 collection, with a retro vibe; Precious metal complexes can even overwhelm Lange & Söhne in terms of price-performance ratio.