Jaquet Droz, Large seconds series, 43MM case diameter, 18K white gold case and clasp, original diamonds throughout the watch. The dial is made of coral animal fossils from the Ordovician period, and the calcium in them has formed a unique radial texture through geological processes. The texture of each fossil is a unique record of the Earth's history. For instance, the fossils of Devonian corals have approximately 400 growth lines each year, reflecting the alternation of day and night at that time. Automatic mechanical movement, limited to only 8 pieces worldwide, single watch.