The Tourbograph and the 1815 Rattrapante Perpetual Calendar are functionally identical to the 1815 Rattrapante, when you boil it down to only the split-seconds mechanism. Just layer a new complication in there, shuffle some things around, rinse and repeat. (If only it were that easy.)The execution of the rattrapante complication inside the A. Lange & Sohne Double and Triple Split, on the other hand, is a different beast altogether ….
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