This is Lange's effort to merge its fantastic column wheel chronograph movement with a perpetual calendar. This watch is the next development of their wonderful and my personal favourite - the Datograph. The perpetual plate is newly developed, with a patented system for switching the dates. The perpetual module adds a whopping 233 parts to the watch, but only 1.9mm to the total 13.5mm of the watch. The watch is housed in a 41mm case in platinum. While this watch is a monumental achievement for Lange, perso...

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