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Saxony supreme: A. Lange & Söhne 1815 Rattrapante Perpetual Calendar

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The new 1815 Rattrapante Perpetual Calendar represents a continuation of the successful series of chronographs by A. Lange & Söhne: it joins the top league of chronographs, the so-called rattrapante or split-seconds chronographs. Stopping elapsed or lap times is handled precisely in the classic manner with two column wheels. The central, superimposed 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 power-reserve displays are located at 12 oclock. The longer blued-steel hand indicates the count of stopped seconds. Conversely, the shorter golden hand in the inner circle indicates when the time has come to replenish the energy of the mainspring via the winding crown.

Perpetual calendar

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Of the 636 individual parts of the newly developed manufacture calibre L101.1, more than 200 components are part of the perpetual calendar mechanism. The watch will faithfully record all months in the course of a calendar year and also indicate all leap years until the year 2100. That year, according to the Gregorian calendar, is not a leap year, which is why the date must be manually advanced by one day, with pushbutton convenience. The same applies to all other secular years, the next one being 2200. The paired calendar indications are positioned at 9 and 3 oclock. 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 newly designed solid-gold lunar disc beneath the subsidiary seconds dial at 6 oclock emulates the synodic lunation so precisely that it only needs to be corrected by one day every 122 years.

A homage to the pocket watch

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Arabic numerals, a railway-track minute scale, gold and blued hands as well as four round subsidiary dials in a clover-leaf configuration characterise the design of the 1815 Rattrapante Perpetual Calendar in the A. Lange & Söhnes grand pocket watch tradition. The prominent case in platinum or pink gold with a diameter of 41.9 millimetres is the final flourish to this horological masterpiece.

Visit the A. Lange & Sohne website

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