The Black Bay Ceramic One 7921/001CN is a one-of-a-kind watch made for the 2019 Only Watch event. The case is crafted from matte black ceramic, while the crown and case back are made of PVD-coated stainless steel. The bezel is also PVD-coated, this time in titanium, and the bezel insert is black ceramic. The watch comes with a rubber strap, featuring an alligator top. The matte black dial has glossy black markings and the hands and indexes are filled with black luminescence. The watch also has a see-through back.