The Vertical Escapement Problem Nobody Wants to Solve
When Maximilian Büsser called me to his Geneva atelier in 2019 to preview the Legacy Machine Perpetual EVO, he mentioned almost as an aside that they'd been working on something "structurally impossible" with Kari [Voutilainen](/brands/kari-voutilainen). Six months later, I understood what he meant. The MB&F Legacy Machine Suspended Escapement (LM SE) doesn't just display its balance wheel vertically—it suspends the entire escapement assembly in a configuration that defies conventional jeweling logic.
I've spent enough time in Voutilainen's Môtiers workshop to know that when he calls something "the most demanding jeweling work I've undertaken," you're dealing with architecture that exists beyond normal manufacturing constraints. The LM SE isn't simply another vertically-oriented regulator. It's a solution to a fundamental friction problem that has kept vertical escapements confined to clocks and demonstration pieces for two centuries.
Engineering a Suspended Architecture
The conventional approach to vertical escapements positions the balance wheel perpendicular to the dial, typically with the balance staff supported by jewels on both sides—imagine a wheel spinning between two walls. This creates asymmetric friction as gravity constantly pulls the balance in one direction against its lower pivot. Antique skeleton clocks demonstrated this beautifully, but their massive balance wheels and reduced amplitude requirements made friction management less critical.
Voutilainen's solution for the caliber LM SE inverts this logic entirely. The 13.4mm balance wheel—proportionally massive for a wristwatch at nearly half the movement diameter—sits suspended from above with its lower pivot terminating in open space. The upper bridge supports the assembly through a single jeweled bearing with a specially profiled synthetic ruby end stone that distributes load across a broader surface area than conventional pivot designs.
This suspension architecture required fundamental rethinking of the balance spring geometry. Traditional Breguet overcoils work in horizontal planes where gravity affects spring behavior uniformly. In vertical orientation with bottom-end suspension, the spring experiences constantly varying gravitational vectors through each oscillation. Voutilainen developed an asymmetric overcoil that compensates for this three-dimensional distortion—a geometry so specific it requires manual formation on his proprietary spring manipulation tools.
The result: a vertically oriented escapement that maintains consistent amplitude across positions, achieving chronometric performance (reportedly within COSC specifications, though MB&F doesn't pursue certification) despite an architecture that conventional wisdom suggests should fail.
The Voutilainen Collaboration: Why This Partnership Matters
Kari Voutilainen isn't MB&F's first independent watchmaker collaboration—previous Legacy Machines involved Stephen McDonnell and Philippe Dufour—but this project demanded capabilities that perhaps only Voutilainen's particular obsessions could address.
I've watched Voutilainen hand-finishing balance cocks in his workshop, working synthetic ruby jewels under magnification that makes quarter-millimeter surfaces look like landscapes. For the LM SE, he needed to engineer not just aesthetically exceptional components but functionally critical ones where tolerances directly impact timekeeping. The upper bridge jeweling assembly required positioning accuracy within two microns—achievable in industrial settings with CNC equipment but demanding entirely different methodology for small-batch artisanal production.
Voutilainen's contribution extends beyond the suspended escapement architecture. The movement finishing throughout the caliber LM SE reflects his influence: frosted bridges with polished bevels, circular graining on concealed surfaces, jewel chatons with polished countersinks. These aren't MB&F's typical aesthetic choices—the brand generally favors contemporary surface treatments. But Voutilainen insisted that a movement exploring classical complications through radical architecture deserved classical finishing language.
The balance cock itself became a signature element. Unlike typical balance cocks that support from above with clearance for the wheel, this design needed to suspend the entire oscillating assembly while remaining visually transparent. Voutilainen developed a forked bridge design, CNC-milled from solid German silver then hand-finished, that provides structural rigidity while framing the balance wheel like a sculpture mount.
Component Scarcity and the Jeweling Bottleneck
Here's what most coverage of this watch misses: the LM SE's production constraints aren't about MB&F's manufacturing capacity or assembly complexity. They're about jewel availability.
Conventional watch jewels—the synthetic ruby bearings that support rotating components—come from a handful of specialized suppliers, predominantly in Switzerland and Japan. These manufacturers produce standardized dimensions optimized for horizontal escapement architectures: jewel holes sized for typical balance staff pivots, end stones profiled for standard load distribution, chatons dimensioned for conventional bridge mounting.
The LM SE requires custom jewel geometries. The primary suspension bearing needs a specialized end stone with asymmetric profiling to manage gravitational load vectors that don't exist in horizontal orientations. The jewel chaton mounting requires non-standard dimensions to fit Voutilainen's bridge architecture. And critically, each jewel needs individualized fitting—the kind of adjustment work that conventional jewel suppliers don't accommodate in their production workflows.
Voutilainen sources and finishes these jewels in-house, applying techniques he developed for his own complications. This means LM SE jewel supply is limited by one person's capacity to prepare these components to required specifications. I've asked Voutilainen directly about scaling this process. His response: "Perhaps I could train someone, but then it wouldn't be this watch."
This creates an absolute production ceiling unrelated to demand or MB&F's manufacturing capabilities. Other brands could theoretically replicate the suspended escapement architecture—the patents cover specific implementations but not the general concept. But without access to properly specified jeweling components, and without Voutilainen's particular expertise in vertical escapement dynamics, the architecture remains functionally inaccessible.
Visual Depth Through Mechanical Necessity
The LM SE's most immediate visual impact—that dramatic balance wheel seemingly floating in space—emerges directly from engineering requirements rather than aesthetic choice. This distinguishes it from other contemporary watches that create visual drama through sapphire construction or skeletonization.
The 44mm white gold case (reference LM SE WG) or red gold case (reference LM SE RG) measures 19.6mm thick, substantial but not exceptional for complicated watches. What's exceptional is how that vertical space gets allocated. Conventional movements stack complications in horizontal layers: gear train at bottom, escapement above, complications layered between. The LM SE organizes depth vertically around the central escapement assembly.
The balance wheel sits prominently at 6 o'clock, its vertical orientation placing the entire 13.4mm diameter in view simultaneously—impossible with horizontal orientations where you see the wheel edge-on. The escapement bridge extends from the movement perimeter inward, creating layered depth as your eye travels from case edge to suspended balance. Behind this assembly, the twin mainspring barrels (providing 72-hour power reserve) occupy the upper movement section, their circular forms creating geometric counterpoint to the balance wheel below.
This organization creates what I call "functional transparency"—visual access to components that directly correlates with understanding their mechanical operation. Unlike skeletonized movements where removing material creates visual interest, here the architecture itself generates visual drama because you're seeing the actual load-bearing structure required for the escapement to function.
Why Other Brands Avoid This Complexity
I've asked several independent watchmakers—people with technical capability to execute suspended vertical escapements—why we don't see more exploration of this architecture. The answers reveal an interesting calculus about complications development.
First, the engineering investment versus horological advancement ratio is unfavorable. Suspended vertical escapements don't improve chronometric performance over well-executed horizontal designs. They solve a problem (vertical orientation friction) that doesn't need solving for functional timekeeping. From a purely technical perspective, the thousands of hours invested in developing asymmetric overcoil geometry and custom jeweling solutions could instead advance chronometer performance, power reserve, or other measurable complications.
Second, the architecture creates ongoing production constraints that conflict with business scalability. Even small independent makers producing 20-50 watches annually want capacity to increase production if demand warrants. The LM SE's jeweling bottleneck creates absolute limits unrelated to market conditions—a planning nightmare for any business model beyond pure artistry.
Third—and this emerged repeatedly in conversations—there's limited historical precedent to reference. Watchmakers developing tourbillon variations or new perpetual calendar mechanisms can study centuries of prior work, understanding what succeeded and what failed. Suspended vertical escapements have essentially no development history in wristwatches. You're engineering from first principles, which multiplies development risk.
Finally, several watchmakers mentioned frankly that collectors interested in suspended escapement architectures represent a very specific market segment. These are people who value radical mechanical exploration over chronometric performance or traditional complications prestige. That audience exists—MB&F has proven it repeatedly—but it's smaller than markets for conventional complications.
The Legacy Machine Context
The Suspended Escapement sits within MB&F's Legacy Machine collection, which explores classical watchmaking concepts through contemporary execution. This differs from the brand's Horological Machine series, where avant-garde cases house unconventional time display mechanisms.
Previous Legacy Machines established the collection's vocabulary: classical round cases, traditional Arabic numeral dials, complications like perpetual calendars and split-seconds chronographs executed with technical innovation. The LM Split Escapement (2017) introduced dual balance wheels for improved chronometric stability. The LM Perpetual (2015) developed a perpetual calendar mechanism immune to damage from incorrect manipulation.
The LM SE extends this lineage by taking a classical element—the visible balance wheel, romantic signature of traditional watchmaking—and reimagining its mechanical foundation entirely. Where 19th-century watchmakers displayed balance wheels horizontally beneath sapphire case backs, Voutilainen and MB&F suspended the assembly vertically, transforming display into engineering challenge.
This positions the LM SE as perhaps the purest expression of MB&F's collaborative approach. The brand doesn't employ in-house watchmakers developing proprietary complications. Instead, they partner with independents whose specific obsessions align with particular mechanical problems. Voutilainen's decade-long exploration of escapement geometry and jeweling precision made him the logical (only?) partner for suspended architecture development.
The Perspective Only Time in Workshops Provides
I've spent enough hours in watchmakers' workshops—from Dufour's farmhouse atelier to Rexhep Rexhepi's pristine manufacture—to recognize when architecture emerges from genuine technical curiosity versus marketing-driven novelty. The LM SE reads unmistakably as the former.
The telling detail: that asymmetric overcoil geometry Voutilainen developed to compensate for three-dimensional gravitational distortion. This component lives entirely inside the watch, invisible without disassembly, contributing nothing to visual impact. Yet Voutilainen spent months refining its geometry because suspended vertical architecture demanded it. That's not marketing. That's a watchmaker solving problems because unsolved problems offend his sense of how mechanisms should function.
The jeweling bottleneck that limits production isn't a manufactured scarcity strategy—it's a genuine technical constraint from architecture that requires components beyond standard supply chains. Other brands could commission custom jewels from specialized suppliers, but that requires minimum order quantities that make sense only for serially produced models. For limited pieces exploring radical architecture, you need a partner who can prepare components individually.
This watch represents something increasingly rare in contemporary watchmaking: architecture that couldn't exist without specific human expertise. Industrial watchmaking achieves remarkable precision through automation and process control. But suspended vertical escapements with hand-formed asymmetric overcoils and individually fitted custom jeweling exist only because Kari Voutilainen possesses particular knowledge, developed through particular obsessions, that hasn't been systematized into reproducible processes.
When production stops—whether because Voutilainen moves to other projects or simply because he's prepared the finite number of jewel sets allocated to this collaboration—the architecture stops with it. No other manufacturer can simply resume production, because the architecture lives partially in documented specifications and partially in one person's hands and eyes and accumulated experience.
That's not sustainability. It's not scalability. But it is, unmistakably, haute horlogerie in its most literal sense: high watchmaking that exists at the upper limits of individual human capability rather than industrial process optimization. The Legacy Machine Suspended Escapement doesn't just defy gravity. It defies the entire logic of how contemporary watch manufacturing operates. And that, ultimately, is why so few brands attempt this complexity—and why the attempt matters.