A. Lange & Söhne Saxonia Datograph Perpetual 410.025E Platinum Silver Dial

A. Lange & Söhne added a perpetual calendar to the Datograph in 2006, and the Datograph Perpetual 410.025E is the Platinum version with a Rhodium dial, produced until about 2011. The model combines the flyback chronograph with jumping minute counter and the outsize date of the 1999 Datograph with a full calendar that needs no correction for the months of different lengths.

The Rhodium dial arranges the calendar around the chronograph: day of the week and month in subdials, a leap-year indication, a moon phase and a day/night display, alongside the twin-window date. The Platinum case is 41 mm in diameter and 13.5 mm high, larger than the 39 mm Datograph, and its sapphire back shows the hand-wound column-wheel movement with its perpetual calendar mechanism. It is fitted with a black alligator strap and a Platinum buckle, suited to the restrained Rhodium dial.