Up Close with the MB&F Legacy Machine Split Escapement

A gorgeously finished new calibre from MB&F.
MB&F LM SE 4

The MB&F Legacy Machine Split Escapement (“LM SE” for short) is perhaps the most practical of the Legacy Machines, showing the time, date and power reserve on the front, and a beautifully decorated movement on the back. And the fact that the calibre is derived from the movement inside the impressive, but pricey, LM Perpetual Calendar, doesn’t hurt.

Visually the LM SE sticks to the well established Legacy Machine aesthetic. Indications on white lacquered sub-dials – the time is at 12 o’clock, date at eight and power reserve at four. As on the Legacy Machine perpetual, the date is advanced via  button at four o’clock and equipped with an identical safety clutch that disengages the button while the date is changing around midnight.

Four different dial finishes are available, each limited to 18 pieces. While the colours differ – red or yellow gold, grey and blue – the dials are all finished with a frosting that’s more pronounced than previous Legacy Machines, giving it almost a stone-like appearance.

MB&F LM SE 2

MB&F LM SE 5

The frosted finish, however, is still done with a wire brush, as on earlier models like the LM101. The two gilt finishes are clearly classically inclined, while the grey and blue feel modern.

MB&F LM SE red gold 3

MB&F LM SE blue 1

Over it all towers the oversized balance wheel. A sleekly polished steel bridge holds up the balance, which has no visible escapement connected, hence the model name. Instead the balance staff runs all the way to the back of the watch, where the escapement resides. That means the balance staff is exceptionally long, running almost the height of the case, while being extremely narrow. Keeping it stable is quite a feat.

MB&F LM SE red gold 1

MB&F LM SE red gold 2

MB&F LM SE yellow gold 3

MB&F LM SE yellow gold 4

MB&F LM SE yellow gold 5

MB&F LM SE yellow gold 6

MB&F LM SE yellow gold 1

Size-wise the LM SE is standard for the line, measuring 44mm by 17.5mm, so it feels large but not exceptionally so. It’s helped by the short lugs angled downwards, allowing it to wear better than the typical 44mm watch, as well as concave bezel that leaves it appearing smaller.

MB&F LM SE grey 1

MB&F LM SE grey 2

MB&F LM SE yellow gold 14

MB&F LM SE blue 2

MB&F LM SE blue 8


Most of the drama takes place on the back. Conceived by watchmaker Stephen McDonnell, the “engine” as MB&F labels it, is essentially the calibre inside the LM Perpetual Calendar, but minus the calendar mechanism. It’s a large movement with artfully shaped bridges and details that recall vintage pocket watches, as the Legacy Machines are intended to do.

MB&F LM SE yellow gold 7

MB&F LM SE yellow gold 11

While each dial finish has a different movement plating to match, all of the movements are constructed and finished identically. The polished bevels, or anglage, on the bridges is impressively executed, as are the polished countersinks on the jewel chatons.

MB&F LM SE yellow gold 12

MB&F LM SE yellow gold 13

Attention is similarly paid to less obvious components, including the spokes of the wheels. A particularly elegant detail is the elongated winding click spring, which is large enough to have bevelled edges and countersinks.

MB&F LM SE blue 6

MB&F LM SE blue 7

MB&F LM SE yellow gold 9

The attention to detail, in fact, extends to the escapement, which sits right in the middle of the movement, mirroring the position of the balance wheel above. The edges of the pallet fork are chamfered, a thoughtful flourish on a barely observable part.

MB&F LM SE yellow gold 10

MB&F LM SE yellow gold movement 8

In its minute details the movement is an intriguing blend of old and new. Despite the predominantly classical aesthetic, the barrel ratchets for the twin mainsprings and the winding wheels are distinctly contemporary. The teeth on the wheels, for instance, are typical of the standards laid out by Swiss horological standards board NIHS.

MB&F LM SE blue 4

MB&F LM SE blue 5

MB&F LM SE grey 3

MB&F LM SE grey 4

Overall the calibre is wonderfully executed and proof that while MB&F is best known for its spaceship-like watches, it can equally do well in classical watchmaking.

Price and availability 

The LM SE is priced at US$79,000 in all iterations. They are already available at MB&F retailers and M.A.D Galleries.


Addition October 21, 2017: More information on the date mechanism was included.

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