A 41mm x 9.9mm Audemars Piguet Royal Oak Double Balance wheel Openworked. This tackles 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, a greatly improved precision and stability.
This model is offered in stainless steel with rose gold hands and hour markers.
Offered brand new with AP warranty.