A. Lange & Söhne has become synonymous with precision, engineering, and artistic craftsmanship. Founded in 1845 in the town of Glashütte, Germany, A. Lange & Söhne has garnered a reputation over time and are renowned for their unique designs, superior quality, and impeccable attention to detail. Despite experiencing difficult times during the 20th century, including being nationalized during the Soviet era, the brand has persevered and regained its position as one of the most respected watchmakers in the world. 

The A. Lange & Söhne 1815 Rattrapante Perpetual Calendar Platinum ref. 421.025 is a true masterpiece in terms of watchmaking craftsmanship and design. It boasts a stunning platinum case with a diameter of 42mm and a width of 15mm, which perfectly complements the intricate and highly precise movement inside. The dial is equally impressive, with its silver face, blue-steel hands, and delicate Arabic numerals. There are a total of four sub-dials on the watch, representing the plethora of functions the watch has from its perpetual calendar, moonphase, power reserve indicator, rattrapante, chronograph, and more. What really sets this watch apart from others alike, however, is its movement. Powered by the calibre L101.1, it is a manually wound mechanism that features an astounding 631 individual parts, with the perpetual calendar alone consisting of 211 parts, and 206 parts constituting the rattrapante-chronograph mechanism. All of which, have been carefully finished and assembled by hand with the use of traditional solutions that challenged Lange's watchmakers to the ultimate. The watch is an incredible example of the brand's commitment to watchmaking, cutting no corners and making sure everything is as precise and luxurious as possible.