Ebnerhard 8 Jours Grande Teille In the 8 Jours collection, craftsmanship, passion, and tradition come together to create hand-wound mechanical watches with an 8-day power reserve. The dial features a patented indicator whose hand displays the watch’s power reserve and indicates the number of days it will continue to keep time. Eberhard & Co.’s innovation is the special, patented winding mechanism, consisting of two stacked springs that, when fully extended, measure over one and a half meters in length. Brand-new, unworn watch, with original case, warranty sealed directly by Eberhard.