Lange 1 perpetual calendar is a luxury watch by A. Lange & Söhne.

In this 2021 presented model in the series Lange 1 with decentralized dial, the month display was implemented with a ring at the periphery of the dial, which advances once a month. In addition to the Lange big date, there is a retrograde weekday display and a leap year display. These displays are jumping realized, which makes the readability much easier.

Furthermore, the watch has a moon phase display with an integrated day/night indicator.

It is available in red gold with a solid silver dial in gray and in a white gold edition limited to 150 pieces with a solid red gold dial. Color-coordinated hands and appliqués in red gold and rhodium-plated gold respectively complete the design. In the red gold version, the hands are additionally luminescent, as are the square hour indices of the minute track.

The automatic manufacture caliber L021.3 is based on the caliber L021.1 of the Lange 1 Daymatic and was equipped with a newly developed winding mechanism.