The watch features an off-centre tourbillon with a titanium carriage, while the balance spring is in silicon, and the escapement is in silicon and anti-magnetic steel. These features, part of Breguet’s pioneering anti-magnetic technology, enable the new 581DR calibre to run at 4 Hz, a high frequency for a tourbillon. The high-energy barrel provides the extra power required by the movement, with 90 hours running time, shown on an indicator at 8.30.
The bi-directional platinum oscillating mass is placed on the outside of the movement, and this isone of the features that helps reduce the movement thickness to just 3 millimetres. The case is just 7 millimetres thick, making the Breguet 5377 one of the thinnest tourbillon watches in the world.
The dial in 18-carat gold is, as usual for Breguet, superbly finished, with four guilloche patterns, and a blue sapphire at the centre of the tourbillon bridge. The case is in platinum, with a finely-fluted caseband and a sapphire crystal caseback. The watch is also available in pink gold.