A. Lange & Söhne Datograph Perpetual Tourbillon Watch, a black model

A. Lange & Söhne regularly releases updated or re-imagined versions of existing or substantially similar watches. For instance, the popularity of the Datograph later inspired the creation of the updated Datograph Up/Down, and the existence of the Datograph Perpetual Calendar has inspired the release of this arguably amazing 2016 reference 740.036F A. Lange & Söhne Datograph Perpetual Tourbillon as a limited edition.

It starts with a return to a concept that, for the most part, has been lost on modern luxury watches - and that is displaying the tourbillon only through the caseback of the watch on the movement side. This concept isn't new for Lange, but uncommon, as I haven't seen it expressed in any other models aside from the Lange 1 Tourbillon Perpetual Calendar.

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