LMX Steel and Brass

Reference# 08.SL.B
Manufacturer's retail price: $122,000
  • Details
  • Description
  • Limited Edition: 33 Pieces
  • Case: stainless steel
  • Size: 44 mm
  • Movement: Manual winding with three mainspring barrels, New bespoke 13.4mm flying balance wheel with inertia blocks
  • Function: Hours and minutes: completely independent dual time zones displayed on two inclined dials, Unique hemispherical rotating power reserve with choice of weekday or 7-day indication
  • Power Reserve: 7 days
  • Dial: White, Frosted Brass
  • Caseback: sapphire crystal with anti-reflective coating
  • Strap/Bracelet: brown hand-stitched alligator strap with stainless steel folding buckle

LMX celebrates 10 years of Legacy Machines. The X is more than just another way to indicate the numeral 10; LMX is the crossroads where the first and second decades of the Legacy Machine Collection meet.

Back in October 2011, MB&F had just launched Legacy Machine N°1, the first creation of a new collection, alongside the existing Horological Machines; one creative lab, two interpretations of time-telling. 10 years later LMX returns to the earliest encounter with the Legacy Machine collection, utilizing the same expression comprising a central flying balance wheel and two dials of stretched white lacquer, each with its own display of hours and minutes. In another nod to the world-first vertical power reserve indicator of LM1, LMX features a completely novel three-dimensional, rotating display that showcases the engine’s impressive seven days (168 hours) of power reserve.

Like a perfectly balanced X, the engine of LMX is deeply symmetrical – not only dial-side but also as observed through the sapphire case back, revealing the three barrels placed evenly around the center, accentuated by the sunray pattern of the Côtes de Genève finishing. A treat for those who can read the language of watch movements, who can discern expert intent and refined purpose behind the placement of each component.


Both the hours and the minutes on each of the sub dials can be set completely independently of each other – dual time zone complications usually do not allow independent adjustment of the minutes. Both dials are tilted at an angle – a complex feature requiring the transfer of energy from horizontal to vertical planes thanks to conical gears.


LMX reveals many functional elements such as the battle-axe-shaped escapement bridge, a new 13.4mm balance wheel with inertia blocks, and gear-train components. Three large wheels are particularly visible: two are set in motion when setting the time, while the gear at 6 o’clock is the common seconds’ wheel. Other refinements include the polished arms of the straight bridges exposed on the dial plate, manually finished to impart a curved, or bercé, profile.


The novel three-dimensional display showcases the impressive 7 days of power reserve. Two markers are positioned on opposite sides of a hemisphere; one framed by an arched scale numbered 1 to 7, another with a scale showing the days of the week. Thanks to the rotation of the entire display, wearers can adjust the orientation of the system when LMX is on the wrist, to choose their preferred mode of power-reserve indication.

2021 Grand Prix d’Horlogerie de Genève nominee – Men’s Complication

2022 Launch of a new edition of the LMX, the LMX “Steel & Brass”.