The slim factor of the Breguet reference 5377 Classique Tourbillon is evident at first glance. The tourbillon is not to be missed for a blue sapphire has been set at the centre of the tourbillon bridge. This is, after all, made for those who desire a thin watch with the tourbillon, a specialty of Breguet.
The Breguet reference 5377 made its debut in 2013 at the annual BaselWorld watch fair housed in an 18K rose gold version (Reference 5377BR/12/9WU) with a 42mm diameter case that was 7mm thick. In 2014, the brand launched the platinum version (Reference 5377PT/12/9WU).
What is noteworthy is that the new Breguet Calibre 581DR with the movement thickness of 3mm has a tourbillon carriage and balance in titanium while the balance spring is made of silicon. The escapement is in silicon and anti-magnetic steel.
This means that the Calibre 581DR in the reference 5377 is one of the thinnest automatic tourbillon wristwatches around.
Moreover, the frequency of the Calibre 581Dr is 4 Hertz or 28,800 vibrations per hour, which is at a rather high frequency for a tourbillon and yet, as the brand notes, does not sacrifice power reserve which stands at 80 hours thanks to the patented “high-energy” barrels.
One reason for the slim factor – the bi-directional platinum oscillating weight at the edge of the movement which is protected by two patents.
The elegance of this wristwatch is brought up not just by its slimness but the finish of the dial as four different engine-turned patterns have been engraved.
The hours and minute hands are complemented by the clous de Paris hobnail pattern edged by a barleycorn motif while the power reserve display has engine-turned straight chevrons, each element having a cross-hatched border.