The A. Lange & Söhne 1815 Rattrapante Perpetual Calendar blends together the technical challenge of a rattrapante chronograph with the exclusive fascination of a perpetual calendar with moon-phase display.
Stopping elapsed or lap times is handled precisely in the classic manner with two column wheels. The central, superposed chronograph hand and rattrapante hand make it possible to measure any number of lap times within the course of a minute. The minute-counter and the 42-hour power-reserve displays are located at 12 o’clock. The longer blued-steel hand indicates the count of stopped seconds. Conversely, the shorter golden hand in the inner circle tells the owner of the watch when the time has come to replenish the energy of the mainspring via the winding crown.
More than 200 components of the total 636 individual parts of the Calibre L101.1 are dedicated to the perpetual calendar mechanism. This perpetual calendar will not need any correction until the year 2100, and then by only one day and just because 2100, just like all other secular years, will not be a leap year. The paired calendar indications are positioned at 9 and 3 o’clock.
The subsidiary dial on the left indicates the date and the day of the week, the one on the right the month and the leap year.
The 41.9 mm case is available in platinum or in pink gold.