Limited to 28 pieces worldwide.
The one and only amazing double flying Tourbillon with differential also comes in this skeleton version in Platinum. 
The epitome of contemporary haute horlogerie signed Roger Dubuis.
Hand wound Caliber RD01SQ - Double flying Tourbillon with differential
Tourbillon carriages visible between 4 and 5 o’clock and between 7 and 8 o’clock, one-minute Tourbillon rotation for each - finely adjusted in six positions 
48-hour power reserve 
Dial - Skeleton - flange set with diamonds and white Roger Dubuis transfers
Water resistant to 50 meters / 165 feet