Luxury version of caliber 8400, which is in turn based on 8500. Self-winding movement with Co-Axial escapement for greater precision, stability and durability. Resistant to magnetic fields greater than 15,000 gauss. Free sprung-balance with silicon balance spring, two barrels mounted in series, automatic winding in both directions to reduce winding time. Oscillating weight and balance bridge in red gold. Luxury finish with exclusive Geneva waves in arabesque.