This I-serial Audemars Piguet Royal Oak Double Balance Wheel Openworked Ref:15407ST.OO.1220ST.01 is rated 9.9 out of 10. It comes with box and paper dated in 2016. The Royal Oak Double Balance wheel Openworked tackles these stabilising issues by fixing a second balance wheel and balance-spring assembly on the same axis. The new patented geometry involves a very complex manufacturing procedure, but the payoff is huge: greatly improved precision and stability. ***Viewing by appointment***
