The Eberhard & Co 8 Jours Aqua 8, reference 21018CA, is a mechanical hand-wound watch featuring a 39.5 mm stainless steel case. It boasts a patented 8-day power reserve mechanism, achieved through two overlapping springs exceeding one and a half meters in length. The watch includes a sapphire crystal, a personalized steel crown, and a caseback secured by six screws. It is water-resistant up to 30 meters. The timepiece is available with an ostrich leather strap and a personalized steel buckle, with options for a Chaland steel bracelet and a Déclic® deployant clasp.