The Audemars Piguet Royal Oak Double Balance Wheel Openworked in black ceramic. Audemars Piguet. There are three references, with cases in stainless steel, black ceramic (limited to 150 pieces) or ...

The second of Rolex’s two patented natural escapements features dual escape wheels with assymetric teeth on a single plane. Rolex. Both versions utilize a pallet-free lever as an intermediary between ...