A model launched in 2004 to offer a "softer" alternative to the noble Datograph, the 1815 is now offered in a split-seconds chronograph and perpetual calendar version. With the help of the overlapping central pair of chronograph and split-seconds hands, an indefinite number of intermediate times can be measured in the space of a minute. In addition to taking into account the different lengths of the months during the calendar year, the perpetual calendar also takes into account all leap years up to the year 2100. It also features a 42-hour power reserve display. The design of this timepiece, offered in pink gold (€162,700) or platinum (€183,000), is inspired by the great tradition of A. Lange & Söhne pocket watches. The movement is the manual L101.1 calibre.
