MB&F - LEGACY MACHINE ‘SPLIT ESCAPEMENT’
MB&F - LEGACY MACHINE ‘SPLIT ESCAPEMENT’

LEGACY MACHINE ‘SPLIT ESCAPEMENT’

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LEGACY MACHINE ‘SPLIT ESCAPEMENT’

There is one technical constant that defines every single watch in the MB&F Legacy Machine collection. Functions may vary, and different complications come to the fore in each edition, but the suspended balance wheel remains literally and metaphorically above everything else. In Legacy Machine Split Escapement, this feature is not only highlighted, but raised to another level of achievement.

 

Just below the highest point of the domed dial crystal, the balance of LM SE beats at a sedate, traditional 2.5Hz / 18,000bph. What is rather less traditional is its construction. Unlike most of the other suspended balances in the Legacy Machine collection — indeed, unlike any other balance outside of MB&F — the balance of LM Split Escapement seems to oscillate on its own, without any visible intake of energy. The essential remaining parts of the escapement, which provide the driving impulse – anchor and escape wheel – are concealed on the opposite side of the movement, almost 12 mm below; hence the name ‘Split Escapement’.

 

Under the balance, the triple-dial design of LM SE gives the time at 12 o’clock, the power reserve indication at 4 o’clock and the date at 8 o’clock. The date can be quickly and easily adjusted thanks to a push-button on the side of the case, next to the date dial.

 

Other design features are natural evolutions of those found in previous Legacy Machines, such as the organically arched balance bridge found in the LM Perpetual. More visibly, LM SE features the micro-textured “frosted” finish that is so closely associated with antique pocket watches of the 18th and 19th century; this traditional technique was presented by MB&F for the first time in the LM 101 ‘Frost’ editions. Since the inspiration of the Legacy Machine collection lies in the era of frosted movements, smooth round watches and glossy white dials, it was only a matter of time before the frosted finish made another appearance at MB&F.

 

Antique watches featuring a frosted finish used acid baths to achieve this effect, but modern methods of replicating a frosted finish involves manually burnishing a metal surface with a wire brush. LM Split Escapement is a celebration of this technique, which is executed completely by hand for all 72 pieces of the launch editions.

 

The full beauty of frosting is brought out in Legacy Machine Split Escapement, with four launch editions in white gold. Each edition, limited to 18 pieces, is distinguished by frosting and movement finish of a different shade, which allows LM SE to embody varying aspects of its personality:

 

- Blue frosted finish paired with rhodium-plated movement for the most classically elegant version;

- Ruthenium frosting with similarly darkened movement evoking new-millennial functionality and putting the focus on the white lacquer dials;

- Red gold frosting and movement conveying warmth and accessibility, its subtle roseate sheen emphasising the intense hue of the blued hands;

- Yellow-gold frosting and movement finish: the strongest aesthetic affinity with the era inspiring the Legacy Machine collection, an era that defined the precepts of modern watchmaking.

 

LM SPLIT ESCAPEMENT IN DETAIL

 

 

THE LM SE ENGINE

 

The first Legacy Machine drew on the atmosphere of wonder and optimism that characterised the World’s Fair expositions of the late 19th and early 20th centuries. The suspended balance was designed to channel this heady mix of emotions, an effect achieved by its sharp departure from established watchmaking tradition. By transporting the impulse jewel, anchor and escape wheel to the opposite end of the engine, Legacy Machine Split Escapement magnifies the visual impact of its balance, akin to an illusionist meticulously hiding all traces of the mechanisms that drive his latest show-stopping opus. And just like any other enigmatic feat of visual wonder, it’s achieved by bending some old rules and writing some new ones.

 

The sensitivity of the balance and the paramount role that it plays in chronometric precision are usually reason enough for watchmakers to avoid straying too far from convention when it comes to escapements. However, the outstanding horological mind of Stephen McDonnell, the watchmaker behind the award-winning Legacy Machine Perpetual, was able to circumvent the real and perceived hindrances to creating a new configuration of mechanical regulator.

 

Legacy Machine Perpetual was the first MB&F creation to utilise the split escapement in 2015, although the attention then was rightfully focused on the groundbreaking new perpetual calendar. Now, with Legacy Machine Split Escapement, the time for its eponymous feature has arrived.

 

Despite the technical hurdles faced in creating the split escapement, the LM SE engine is still designed with aesthetics and classicism in mind — beautifully symmetrical, with bridges that frame their underlying components and curve smoothly around gold chatons and countersunk jewels.

 

Dial-side, the balance bridge is the third iteration of a component that has been central in all Legacy Machines thus far. In the first Legacy Machines, the bridge was characterised by an industrialist aesthetic, but progressed to a more rounded form with a wedge-like base in Legacy Machine 101 and in the final edition of Legacy Machine N°1. In LM SE, similar to Legacy Machine Perpetual, the bridge assumes an organically arched line from end to end.

 

 

TECHNICAL CHALLENGES OF THE SPLIT ESCAPEMENT

 

In watchmaking parlance, the escapement is the set of components that allows the stored energy of the mainspring to escape in a series of regular controlled impulses instead of unwinding all at once. In its most common configuration, it consists of the balance assembly, anchor and escape wheel, and horological tradition dictates that these components should be as close to each other as possible to minimise external disturbing influences. In this particular area of horology, which is rarely challenged, MB&F is doing a new thing.

 

Whilst the balance of LM Split Escapement beats just under the dial-side dome of sapphire crystal, its impulse jewel, anchor and escape wheel are on the other side of the movement, visible through the transparent caseback. This necessitates an unusually long balance arbour, which runs through the centre of the movement, a true milestone of micro-mechanical and manufacturing technique.

 

The distance between the balance wheel and the impulse jewel is a full 11.78 mm, the length of the arbour that traverses the movement and projects through the dial to support the oscillator. A longer arbour increases the likelihood of disrupting influences on the oscillator, as well as the potential distorting effects of a long axle under continuous torsion. The inertia of the balance and the rigidity of the arbour are key factors in this delicate equation, and the LM SE engine is precisely engineered to ensure its chronometric integrity.

 

In the Split Escapement, stability of construction becomes exponentially more important than it usually is, which significantly restricts the margin of dimensional error during the manufacturing process. In addressing this, the balance arbour is fitted at both ends with anti-shock jewel bearings, and the bridge that holds the anchor and escape wheel is separately fixed for optimal fine adjustment.

 

Because a longer balance arbour has a higher mass, which potentially detracts from the amount of energy ultimately transmitted to the oscillator, the LM SE engine is driven by two barrels in parallel, which allows up to 72 hours of optimal timekeeping.

 

 

TRADITIONAL FINISH

 

The burnished surface finish seen under the stretched lacquer dials of Legacy Machine Split Escapement is known as frosting, and is closely associated with watch movements from the 18th and 19th century. It was originally functional as well as decorative, providing an oxidised matte surface that resisted tarnish and gave off a subtle and even sheen, which is prized by antique collectors and enthusiasts.

 

Traditional methods of creating the frosted finish are no longer practicable, due to its hazardous nature (the procedure involved heating metal over an open flame before dipping it in concentrated nitric acid). To achieve the same effect, MB&F works with specialist craftsmen to recreate the texture and sheen of frosting without the use of chemicals.

 

The surface to be frosted is hand-worked with a wire brush, creating minute indentations one small area at a time. Each time, the wire brush must meet the metal surface with exactly the same angle and the same amount of pressure, and the indentations have to be evenly distributed over the entire surface in order to create the desired finish.

 

For Legacy Machine Split Escapement, a wider, more diffuse frosted finish was used, to accommodate the larger area and to draw attention to the hand-worked process. The surfaces were then PVD treated to colour them — blue, ruthenium, red gold or yellow gold.

 

Technical specifications

LM SPLIT ESCAPEMENT TECHNICAL SPECIFICATIONS

 

 

4 white gold launch editions limited to 18 pieces each, with a frosted dial plate in blue, ruthenium, red gold or yellow gold.

 

 

ENGINE

- Movement developed for MB&F by Stephen McDonnell.

- Split escapement with the balance wheel suspended above the dial and the anchor under the movement.

- Manual winding with double mainspring barrels.

- Bespoke 14mm balance wheel with traditional regulating screws visible on top of the movement.

 

 

FINISHES

- Superlative hand finishing throughout respecting 19th century style

- Polished and Bevelled internal angles highlighting hand craft

- Geneva waves

- Hand-made frost and engravings.

- Power reserve: 72 hours

- Balance frequency: 2.5Hz / 18,000bph

- Number of components: 314

- Number of jewels: 35

 

FUNCTIONS

- Hours & Minutes

- Date

- Power-reserve indicators.

- Push-button next to the date dial for quick adjustment of the date.

 

CASE

- Material: launch editions in 18K white gold

- Dimensions: 44mm x 17.5mm

- Number of components: 49

- Water resistance: 30m / 90' / 3ATM

- Sapphire crystals on top and display back treated with anti-reflective coating on both faces.

 

STRAP & BUCKLE

- Black or brown hand-stitched alligator strap

- White-gold folding buckle.

 

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