For its first chronograph, independent watchmaker MB&F teams with Irish watchmaker Stephen McDonnell to launch the Legacy Machine Sequential EVO, a two-column-wheel chronograph with split-second, independent and lap timer modes – a watchmaking premiere.
The new watch, powered by MB&F’s twentieth caliber, boasts a ‘Twinverter’ switch that controls both chronograph systems.
The binary switch inverts the start/stop status of each chronograph. As MB&F explains: “this means that if both chronograph displays happen to be stopped (at zero position or otherwise), pressing the Twinverter (at 9 o’clock) will cause both of them to start simultaneously. If they are both running, the Twinverter makes them stop. If one is running and the other is stopped, the Twinverter stops the one that is running and starts the one that is stopped.”
Belfast-based McDonnell previously worked with MB&F to finalize the MB&F HM1 and most famously developed the GPHG-award-winning MB&F Legacy Machine Perpetual.
His design for the new watch allows the user to perform the same functions as a split-seconds chronograph. But overall, McDonnell focused the design for everyday use rather than specifically for sporting functions, according to MB&F’s Charris Yadigaroglou. Most of the new timing modes are novel to this design and not available when using a traditional chronograph.
For example, in ‘independent mode’ the wearer can assist with varied cooking times. In this so-called ‘pasta mode” the wearer could operate the two chronographs via their respective pushers. One might start when placing pasta into boiling water and the other can separately time when vegetables go in the oven. Additional modes include Simultaneous mode, Cumulative mode and Sequential mode.
MB&F places McDonnell’s caliber into its sporty EVO case much like the case that houses the latest example of the LM Perpetual. This is a 44mm by 18.2mm zirconium structure with no bezel, a domed sapphire crystal, a screw-down crown (offering 80 meters of water resistance) and MB&F’s own anti-shock FlexRing system. 
MB&F will launch the new watch in two versions. One features an ‘atomic’ orange CVD dial plate and the second features a ‘coal’ black PVD dial plate. Both come with an integrated rubber strap with a folding titanium buckle. Price: $180,000.
Specifications: MB&F Legacy Machine Sequential EVO
Movement: Fully integrated dual chronograph system developed for MB&F by Stephen McDonnell, featuring Twinverter switch allowing multiple timing modes. Manual winding with double mainspring; Balance frequency: 3Hz (21,600 vph). Three-days of power reserve. Flying balance wheel with regulating screws at 12 o’clock, Breguet overcoil. Superlative hand finishing; internal bevel angles highlighting handcraft; polished bevels; Geneva waves; hand-made engravings, darkened bridges (NAC finish). Power reserve indication at the back of the movement.
Dial: Galvanic black dials with Super-LumiNova on numerals and hands.
Functions: Time display (hours/minutes) at 6 o’clock.
Left chronograph: Seconds displayed at 9 o’clock and minutes at 11 o’clock; start/stop pusher at 10 o’clock and reset at 8 o’clock.
Right chronograph: Seconds displayed at 3 o’clock and minutes at 1 o’clock; start/stop pusher at 2 o’clock and reset at 4 o’clock.
Twinverter pusher at 9 o’clock: binary switch that inverts the current start/stop status of both chronographs.
Case: 44mm by 18.2mm zirconium. Water resistance to 80 meters. Screw down crown. FlexRing annular dampener fitted between case and movement, providing shock protection along the vertical and lateral axes. Sapphire crystals on top and display back treated with anti-reflective coating on both faces.
Strap: Integrated rubber with titanium folding buckle.
Price: $180,000.
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