The Twenty-8-Eight Tourbillon Prestige houses the calibre DW 8015, developed from the DW 8014 movement that was first presented in 2010. This automatic Tourbillon introduces the patented Automatic Sequential Winding (A.S.W) device, driven by a peripheral oscillating rotor.
The A.S.W. device distributes a constant flow of energy to the main gear-train thanks to the sequenced winding of the barrel. Such a technical prowess makes it possible to obtain an ideal functioning range through the use of a single, manual-type barrel.
Moreover, it avoids all the running defects observed when slip-springs are used on conventional automatic calibres.
The peripheral oscillating rotor is attached to a ring with a sinusoidal profile on its inner edge. This particular shape will, in turn, activate the patented A.S.W system which enables the movement to always operate in an ideal functioning range, between 92 and 96% of the main-spring torque. The escapement is therefore guaranteed to always receive a constant and stable flow of energy thanks to this sequenced winding.
The method of displaying the dead-beat seconds hand in the centre of the dial makes for easier reading of the time. In direct contact with the Tourbillon cage, the ticking dead-beat seconds hand marks a pause for each second counted, which beautifully outlines the precision level achieved by the oscillating balance.
The heart of the balance beats to the rhythm of a Straumann Hairspring® with Phillips curve.
This new movement fully complies with the very demanding finishing norms established by the DeWitt Manufacture: Circular Côtes de Genève, satin-brushed surfaces, circular graining, polishing and bevelling.
The construction of the movement and of the dial takes its inspiration from the world of architecture, particularly the industrial metallic structures. Thanks to an open-worked mainplate, the carriage of the Tourbillon is thus suspended in the air, producing an effect of transparency and of plunging into the very heart of the movement. The gear-train is unveiled through a dial featuring a grid insert. This robust, masculine aesthetic is reinforced by a series of screws.
The 46 mm case in 18-carat rose gold, water-resistant to 30 m and adorned with DeWitt imperial columns, matches the applique "W" signature in 18-carat rose gold at 12 o'clock, the hands and the gear-train of the movement. The 72-hour power reserve is indicated at 9 o’clock by a hand that covers a 180 degree segment.
The Twenty-8-Eight Tourbillon Prestige is available with a white or green lacquered dial, each version produced in a limited edition of 99 pieces. It is fitted with a semi-matt brown alligator leather strap, equipped with a 18-carat rose gold triple blade folding clasp.