MB&F - MB&F legacy Machine Split Escapement Titanium Cadran Vert
MB&F - MB&F legacy Machine Split Escapement Titanium Cadran Vert

MB&F legacy Machine Split Escapement Titanium Cadran Vert

MB&F | 70'800 € Tax inc.

Available
Notice of laurent

See other pictures

MB&F legacy Machine Titane Cadran Vert

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.

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; and a limited edition of 33 pieces in titanium with a sun-ray-finish, green CVD dial.

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.

Superlative hand finishing throughout respecting 19th-century style; bevelled internal angles highlighting hand craft; polished bevels; 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 & indications

Hours, minutes, date and power-reserve indicators.

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

 

Case

Material: launch editions in 18K white gold; grade 5 titanium edition

Dimensions: 44mm x 17.5mm

Number of components: 49

Water resistance: 30m / 90' / 3ATM

 

Sapphire crystals

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

 

Strap & buckle

Black or brown hand-stitched alligator strap with white-gold or titanium folding buckle matching the case.

Who's who

Read more