In an elegant and subtle manner, the LANGE 1 TOURBILLON PERPETUAL CALENDAR integrates a perpetual calendar and a tourbillon in the inimitable design of the LANGE 1. As a tribute to its anniversary, A. Lange & Söhne introduces the most complicated model of this watch family in a 25-piece limited white-gold edition with blued-steel hands. 

The argenté-coloured dial of the “25th Anniversary” edition has discreetly nuanced shades of blue. The palette ranges from thermally blued-steel hands to all inscriptions, including the numerals of the outsize date and the alligator leather strap. 

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Only a modest epigraph at 12 o’clock reveals a further function. This is because the 69-part tourbillon with the patented stop-seconds mechanism is visible only from the movement side. There, the filigreed cage rotates about its axis once a minute to eliminate the influence of gravity on Lange’s proprietary cam-poised balance. The stop-seconds mechanism makes it possible to instantly stop the tourbillon cage with the balance at any time by pulling the crown so the watch can be set with one-second accuracy.