A Lange Sohne 2025 Perpetual Calendar Rattrapante. A manifestation of three of the most complex watchmaking innovations, the watch showcases the rare combination of a rattrapante chronograph with a perpetual calendar. The fully polished band of the pink gold 1815 rattrapante perpetual.

The perpetual calendar mechanism correctly displays the individual durations of each month in the course of a calendar year, including all leap years until. The horological masterpiece that is the 1815 rattrapante perpetual calendar was introduced in 2013.