Audemars Piguet_Royal Oak Tourbillon

Royal Oak Tourbillon is an addition to the watch escapement and lining innovative streak. It was developed in 1795 by Swiss and French watchmakers (Audemars Piguet) who borrowed the original idea from an English watchmaker...
It uses the gravity phenomenon where the effects of gravity are captured by mounting the escapement and balance wheel in the rotating cage in order to cancel out the effect of gravity when the timepiece (escapement) is rotated. These luxury timepieces are manufactured in southwestern Switzerland. Where to buy