Name: MB&F Legacy Machine Sequential EVO LM Sequential EVO
Brand: MB&F
SKU: LM Sequential EVO

The LM Sequential EVO solves a problem most chronographs ignore: what do you time when two things are happening at once. Two fully independent chronograph mechanisms share a single movement but answer to separate pushpieces, letting you track overlapping intervals without sacrificing one to reset the other. In titanium EVO guise, it is MB&F's most practically focused watch.

What it is

MB&F collaborated with Stephen McDonnell, the independent watchmaker behind some of the most technically complex split-seconds work in contemporary horology, to build what is essentially two chronographs in one movement. The concept debuted in the Legacy Machine Sequential, a precious-metal dress configuration. The EVO variant followed in 2022, transplanting the mechanism into a 44mm titanium case with a more legible, sporting layout suited to actual use at a circuit or on a boat.

McDonnell's contribution was the dual-axis architecture: each chronograph runs on its own column wheel and coupling system, entirely separate from the other. The result is a watch you can realistically hand to a driver, a cyclist, or anyone who needs to time two things that do not start and stop together.

Buying notes

The movement is genuinely complex and MB&F's service network outside Geneva is thin, so factor in travel costs and potential wait times before buying. At 44mm in titanium the EVO wears larger than the dimensions suggest because the dial layout pushes subdials to the outer edges; buyers with smaller wrists should try it before committing. The dual-chronograph complication means twice the number of column wheels, coupling levers, and reset hammers to maintain, and service estimates reflect that complexity.

Earlier Legacy Machine Sequential examples in gold have appeared on the secondary market at steep discounts, which has created some pricing pressure on EVO references; expect grey market prices to sit meaningfully below retail but verify provenance carefully. Water resistance is rated to 80m, which is better than most complicated watches but not a specification to push casually.

Market read

The LM Sequential EVO retails above $150,000 and secondary market pricing has generally stayed close to retail given limited production. Because the EVO case is more wearable than the original LM Sequential, collector interest in the titanium references has remained steadier than in the precious-metal variants. Unworn examples with full set and factory stickers command a premium; worn pieces with missing paperwork trade at a meaningful discount.

This is not a liquid reference and finding a motivated seller takes patience.

Service expectations

The movement is the caliber developed in collaboration with Stephen McDonnell's workshop and assembled by MB&F. MB&F recommends service through their authorized network, with Geneva as the primary hub for complex work on this caliber. Given the dual-mechanism architecture, insist on a factory or authorized service rather than an independent, at least while the watch is still within a reasonable age range.

Editorial copy is AI-drafted from primary sources and reviewed by Grail Atlas before publication. Where the text is uncertain about a fact, it says so. Email corrections@grailatlas.com if something reads wrong. Signals on this page (community, OSINT) are clearly separated from the editorial sections.

GPHG 2022Aiguille d'OrGrand Prix de l'Aiguille d'Or

Entry to the Grand Prix d'Horlogerie de Genève is voluntary and made by the brand. An entry is a watch registered for that year's competition, not a jury verdict, and several large houses including Rolex, Patek Philippe and Omega do not take part at all.

Common#2 in familyOfficial press photos

What it was up against

Chronographe, GPHG 2022

The Chronographe category at GPHG 2022 held 17 entries. These are the other 16.

Filter the full GPHG field for Chronographe, 2022

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In-house manufacture caliber · caliber MB&F LM Sequential (developed with Stephen McDonnell)

Large case: suits wrists 7 in+ (18 cm+)

44 mm case. A bold, statement-size wear. Best suited to larger wrists where the case sits flush.

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Authentication

The split-seconds function must allow the two chronograph hands to split independently on the second pusher press and re-join on reset; any failure is a rattrapante mechanism fault.

Known issues in the market

Split-seconds (rattrapante) function is the diagnostic; hands must split independently.
Re-join on reset must be clean; any sticky re-join indicates a rattrapante fault.

Area	What to check	What is correct	Red flag
movement	Rattrapante split function	Two chronograph seconds hands split independently on second pusher press	Hands do not split independently; rattrapante mechanism fault
movement	Rattrapante re-join on reset	Both hands re-join cleanly on reset; no sticky or misaligned re-join	Sticky or misaligned re-join; rattrapante mechanism fault
case	Sequential EVO case profile	Case profile consistent with official LM Sequential EVO specification	Case profile variation; non-genuine or modified case

Common legitimate replacements

No replacements; MB and F authorized service only.

Expert resources: MB and F direct; Stephen McDonnell documentation; authorized service.

Authentication guide

Last reviewed June 2026

The LM Sequential EVO houses two independent chronograph mechanisms controlled by a split-column wheel, developed with Stephen McDonnell. Titanium sport case at 44mm. No replica exists; the twin-chronograph architecture is unique in the independent sector.

Known reproduction risks

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LOW

No known replica exists. The dual-chronograph architecture with split column wheel operation is mechanically unique and cannot be replicated outside a high-level independent atelier.

Any example with a single chronograph display is a different reference
Absent or nonfunctional second chronograph mechanism is an immediate red flag

Verify both chronograph mechanisms start, stop, and reset independently before purchase.

Dial variants by era

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Era	Description	Identifiers
2022 to present	Open dial with the large suspended balance wheel at 12 o'clock and two separate chronograph displays visible on the dial. The column wheel for both chronographs is visible from the dial side. Available in black, white, and blue dials.	Two fully independent chronograph mechanisms, each with its own pushers Split-column wheel architecture visible through the open dial Suspended balance wheel at 12 o'clock on the LM bridge Titanium case with rubber strap LM Sequential EVO designation on dial

Service part flags

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Column wheel and chronograph bridges

Original: The dual column wheel mechanism is the visual and functional centerpiece. Both column wheels should be visible from the dial side and operate independently.

Replacement tells

Asymmetric finishing on column wheel components
Column wheel operational on one side only
Evidence of lubricant overflow on bridges

Pushers

Original: Four chronograph pushers: two on each side at 2/4 and 8/10 o'clock positions, corresponding to the two independent mechanisms.

Replacement tells

Pusher heads with different surface finish or diameter
Pushers operating the wrong mechanism

Case back markings

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2022 to present

MB&F engraving with LM Sequential EVO reference
Individual serial number
Ti (titanium) material designation
80m water resistance rating

Movement tells

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When both chronograph mechanisms are engaged simultaneously, the balance wheel amplitude should remain stable; amplitude drop under dual chronograph load points to a mainspring or service issue.
The MB&F McDonnell co-development movement should exhibit exceptionally clean column wheel geometry under magnification; rough or asymmetric tooth profiles indicate non-factory service.
MB&F service records should accompany the watch; the dual-chronograph caliber requires specialized service tooling not available outside the authorized network.

Sources: MB&F official; MB&F authorized service network.