New: hands-on with the MB&F HM11 “Architect”

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MB&F adds to their Horological Machine collection with the new HM11 “Architect”, and introducing their 21st caliber, inspired by architecture of the 1960s.

Press Release information with hands-on commentary and live photographs in italics.

New: hands-on with the MB&F HM11 “Architect”

The retail price for the MB&F HM11 “Architect” is CHF 198,000 / EUR 207,000 / USD 230,000. Prices are before taxes.

Hands-on commentary

Another spectacular release from MB&F. We never cease to be amazed by the creativity of Max Büsser and his team. And after almost 4 years (a long time in the MB&F universe) since the introduction of the HM10, we now see the Horological Machine collection being updated with a new member. And the release of the 21st caliber since the start of the company.

We met up with Max during his recent visit to Singapore on 25 October and had the opportunity to see him explain the novelty to us in person. As usual, he was full of energy and enthusiasm.

Instead of the car inspired designs that Max has been pulling off year after year, this time, the design inspiration comes from architecture. Max’s vision of a house with 4 rooms. Each room with a sub-dial showing a specific face to the owner. The entire 4 room house is in a rotating platform, so that at any one time, one of the rooms can be made to show its dial to the owner.

Viewed from the top, the structure looks like a cross with eight arms, four of which house the four rooms with their sub-dial facing outwards. The other four arms are in between the rooms, under a large sapphire glass dome and displaying the flying tourbillon.

And in each of the rooms, is a sub-dial which displays the hours and minutes, the power reserve indicator, a thermometer with the final room displaying an engraved badge of the MB&F signature battle axe which serves as the time-setting crown. Interestingly, the sensor for the thermometer is directed to sense the temperature of the environment, and not of the wrist, avoiding the oft repeated error in many thermometers on wrist watches (which are admittedly few).

Winding is manual, by turning the entire case clockwise, the wearer can orientate the room such that the sub-dial will the direction of view. In the photograph above, the HM room is turned to face the wearer. With each 45° clockwise turn indicated by a tactile click, adding 72 minutes to the barrel. Thus in 10 complete rotations, the watch is completely wound to its 96 hour autonomy.

Max Büsser, October 2023.

The entire assembly wears rather smaller than its 42mm diameter suggests, even with the high dome of the sapphire crystal measuring 23mm, the watch easily slips under a cuff, and remains unobtrusive, and rather elegant. Quite an achievement to pack all that under this small a package, and a triumph by designer Eric Giroud to deliver such an aesthetically pleasing watch.

The launch edition will comprise of two references – in titanium in a blue dial plate and in titanium with a red gold plate, both limited to 25 pieces each. And both set at the same price.

Release information

According to the famous Swiss architect Le Corbusier, “une maison est une machine à habiter“ (a house is a machine to live in). The Machines of MB&F are habitable; the stories they tell locate us in different places or different times, and sometimes different worlds. It could be said that an MB&F Machine is not worn; it is lived.

This is not always the easiest concept to grasp, because a watch is not a house, right? A house is a house, and a watch is a watch; there is no confusion, it is black and white, right? With its latest creation, MB&F further blurs the line between the two, and the result is the grey of steel rebar, the grey of freshly sprayed concrete.

Introducing the MB&F Horological Machine Nº11 Architect.

The house that Max built

Somewhere around the mid- to late 1960s, architecture entered an experimental phase, starkly different from the designs of the previous decade. Post-war buildings were pragmatic, rectilinear forms, hastily erected to fulfil a purpose. But then a small yet reactive movement began taking hold, one that was surprisingly humanistic in its approach, though not in a way that architectural scholars would use the term.

It was humanist in the sense that it moulded space around the form of a human body, the spherical scope of vision perceived by the human eye, the radial ambit of human limbs moving through the air, the roundness of the breath that inflates our lungs and creates ephemeral vapour halos on car windows in winter.

These architects, some of whom eschewed that title and instead called themselves habitologists, built houses which appeared as if they had been exhaled out of the earth, or as if the land had flexed its fingers and forgotten to curl them fully back up again. They bubbled, they undulated, they arched like an extended sinew. And when Maximilian Büsser, founder of MB&F, looked at one of these houses, he thought, “What if that house was a watch?”

A central flying tourbillon forms the heart of the house, pushing skyward under a double-domed sapphire roof. Fittingly, for a mechanism that is spatially and functionally at the origin point of the watch, its quatrefoil-shaped upper bridge recalls the shape of clerestory windows in some of humanity’s greatest temples to its Creator, or perhaps the shape of a zygote undergoing cell division at the moment of conception. From this spinning core, four symmetrical volumes reach outwards, creating the four parabolic rooms of the house that is HM11 Architect.

Turn the house to access each room; the entire structure rotates on its foundations. The 90° angle of offset between each room means that you can position HM11 with one of its rooms directly facing you, or with one of the corridors of the house running towards you and rooms obliquely to each side. This versatility in display orientation also has a practical use. HM11 Architect is an energy-efficient construction — each 45° clockwise turn is signalled by a tactile click under the fingers, and delivers 72 minutes of power directly to the barrel. After 10 complete rotations, HM11 is at its maximum autonomy of 96 hours.

While all four rooms share a similar interior — glossy white walls with a full sapphire crystal window pane — each of them has a different function. The time room is where you go to retrieve the hours and minutes. Rod-mounted orbs serve as hour markers, using larger and lighter polished aluminium orbs for each quarter and smaller and darker polished titanium orbs for the rest. Red-tipped arrows point to the hours and minutes, providing a rare accent of colour to the otherwise Spartan time room.

The next room, 90° to the left, is where the power reserve display resides. Following the design schema established by the time room, rod-mounted orbs are paired with a red-tipped arrow to show how much running autonomy is left in the HM11 barrel. Proceeding clockwise, the five orbs increase in diameter until the final polished aluminium orb, 2.4mm in diameter, indicating the full 96 hours of power reserve.

An instrument rarely seen in horological contexts (though familiar in domestic ones) is installed in the next room — a thermometer. HM11 uses a mechanical system of temperature indication with a bimetallic strip, which may seem quaint in this age of instant high-precision electronic thermometers and thermostat-regulated smart homes. This mechanical system functions without any external energy input and is available in Celsius or Fahrenheit display variations.

One last room remains, a white void, its only aesthetic feature a tiny round badge engraved with the MB&F battle-axe motif, set into the sapphire-crystal window. But this seemingly empty space functions as the time-setting crown of HM11. Pull on the transparent module, and it opens with a click. It is the front door and key to HM11; you turn it to relocate yourself in time.

While the peripheral rooms of HM11 are surrounded by exterior walls of polished grade-5 titanium, the central atrium is open to the light, covered by a double-arched sapphire crystal roof. Underneath, the in-house HM11 engine hums away, its cadence set by the 2.5Hz (18,000 vph) balance of the flying tourbillon. Plates and bridges are coloured with a physical vapour deposition (PVD) process, coming in ozone blue or the warm solar hues of 5N gold, limited to 25 pieces each for the two launch editions of HM11.

More about the HM11 case

The houses that sparked the genesis of Horological Machine Nº11 Architect in Max Büsser’s mind all had an organic quality about them. They had forms that were playful, that swelled and bulged out in unexpected places. How does one begin to translate a thought experiment into a real creation? How do you answer the question of “What if a house was a watch?” The first blueprints were made in 2018 by Eric Giroud, keystone of the MB&F design process, whose architectural background clearly informs the layout of HM11. A central atrium that gives onto four peripheral rooms. Transparency and light. Interior volumes that interact with exterior perspectives. Curvilinear morphology, primitive in its affinities with the human form, futurist in its unboxed vision.

The materials chosen to represent the two launch editions of HM11 Architect are titanium and sapphire crystal. Both are known for being extremely challenging to machine, such that it was only within the last two decades that their use became feasible in watches of complex form. The lower half of the HM11 case is a highly three-dimensional Grade-5 titanium shell with different inner and outer surface profiles. The upper caps of each of the four HM11 rooms are machined separately, since they can be affixed only after the movement has been installed. Close to a week is required to complete the HM11 case, comprising all the operations of milling, finishing and quality control.

The Horological Machines of MB&F have established a reputation for increasing the sophistication of shaped sapphire crystal components used in watchmaking, and Horological Machine Nº11 is no exception. There are six externally facing sapphire crystal components in the case of HM11, the largest of which consists of two separate sapphire crystal domes stacked concentrically to form the transparent atrium roof of HM11. Dome skylights feature prominently in 1970s residential architecture, a result of that period’s fascination with injection-moulded acrylics and adventurous design.

An unprecedented feature in watchmaking is the see-through crown, close to 10mm in diameter, that allows an unimpeded view directly into the movement. A crown of this size in sapphire crystal, whilst undeniable in its aesthetic impact, comes with specific technical challenges to be overcome. As the primary point of ingress to the movement, a watch crown must be equipped with gaskets that prevent water or dust particles from entering the watch and compromising its performance. Conventional watch crowns require gaskets that measure around 2mm in diameter, which in most instances provide adequate protection. Such gaskets are primarily made from rubberised polymers, and create friction when the crown is turned, but in negligible quantities that go unnoticed during normal use.

In Horological Machine Nº11, a conventional gasket sized in proportion with the crown five times bigger would have generated so much friction that the crown would essentially have braked and been unusable. Instead, two sets of gaskets are used, similar to a double airlock security system in spacecraft or submersibles. Towards the outer edge of the watch, a large low-friction gasket creates just enough of a seal to stop dust from entering via the sapphire-crystal window. A watertight gasket, much smaller in diameter, is located closer to the centre of the movement, surrounding the crown axis. A total of 8 gaskets are dedicated to the sapphire crown alone.

Ensuring the integrity of the case and the movement within are in fact a total of 19 gaskets, necessitated by the complexity of the case and its various external components. The largest gasket used in HM11 Architect is of O-ring construction, shaped in all three dimensions and placed between the case and the bezel. A custom mould was cast for this one gasket; together with the 18 others, it delivers a purpose-engineered solution as a guarantee that the HM11 house remains safe from the elements, with a water resistance rating of 2ATM (20 metres).

The “bubble houses” of the mid- to late 20th century were enabled by evolutions in building technology, using materials and methods that seemed wildly implausible at first — or at least until someone actually made a house with one. And so, it is with the MB&F Horological Machine Nº11 Architect. New things often require new ways. True change starts when you think differently, but it endures when you live differently.

Despite its 3-dimensional, architectural conception and the complexity of its movement, the HM11 case surprisingly measures only 42mm in diameter. It sits sleekly and comfortably on the wrist, thanks to the curved case feet that are also the strap attachment points. These allow the watch to fit a variety of wrist sizes – and also provide stability when the case is turned to wind the barrel.

More about the HM11 engine

At the literal and conceptual heart of the HM11 Architect engine are two words: power and efficiency.

While the barrel forms the repository of all power in any mechanical watch, the ultimate source of this energy is the person whose wrist the watch occupies. The barrel is invested with energy through incidental kinetic action (in conjunction with an automatic winding system) or deliberate manual input (via the winding crown). These two methods of supplying energy are combined in HM11. Winding the watch can be both incidental — a secondary effect of changing the room orientation — and deliberate. The action itself is amplified; instead of turning a crown of small diameter, you turn the watch itself, adding greater weight to the relationship between HM11 and its wearer.

A standard watch with a power reserve of 48 hours requires between 20 and 30 full turns of the crown to be fully wound. With HM11, its 96 hours of power reserve can be completely rewound after just 10 full clockwise rotations of the case.

Relocating the winding action from a small-diameter component like a crown to the case itself also raises the upper limit of torque you can apply to the winding mechanism. It’s simple physics — increasing the diameter of a rotating element reduces the energy required to turn it. This means that the mainspring barrel of HM11 Architect can be rewound more directly and more quickly.

The flying tourbillon that controls the timekeeping ability of HM11 Architect is today a key part of the mechanical identity of MB&F, appearing in Horological Machines 6 and 7, as well as Legacy Machine FlyingT. Its large balance wheel boosts the overall inertia of the system, offering benefits in terms of chronometric stability, but tourbillons (and flying tourbillons in particular) are vulnerable mechanisms, susceptible to shocks that can interfere with performance. Conventional shock-protection solutions in watchmaking are designed to protect specific components, notably wheel pivots, whereas general shock-proofing solutions that shield the entire movement are uncommon. Rather than applying additional shock-proofing elements to individual watch components, HM11 incorporates a full-system dampener, consisting of four high-tension suspension springs that sit between the movement and lower-case shell.

These are not simple coiled springs made from wire, but custom springs laser-cut out of a low-carbon high-hardness steel tube with chrome finish. The specific alloy composition and crystalline structure of this steel provide exceptional resistance to wear, while its finish and cylindrical form impart aesthetic value — despite the fact that the springs are completely hidden from view. Such springs are used nowhere else in modern watchmaking except at MB&F, and are derived from technologies designated primarily for the aerospace industry.

Importing new technology from other industries may not be an uncommon practice in modern watchmaking, but importing old technology is certainly a rarer occurrence. The mechanical thermometer of HM11 Architect runs on the same centuries-old principle of exploiting differences in thermal expansion coefficients between materials, but its utilisation here constitutes a novel and unusual watchmaking function. A bimetallic strip is formed into a compact spiral and coupled with a rack and lever such that the expansion and contraction of the spiral changes the rotational angle of the rack, moving the lever which in turn controls the motion of the temperature indication hand. Whilst traditional bimetallic strips were made from laminated copper and steel, modern manufacturers of mechanical thermometers have improved the precision and reliability of their instruments with proprietary alloys. The HM11 mechanical thermometer measures temperatures ranging from -20–60°C (0–140°F), with display variations available in the two most common temperature scales.


HM11 Architect is available:

– in titanium with blue dial plate limited to 25 pieces;

– in titanium with red gold dial plate limited to 25 pieces.


Three-dimensional horological engine featuring bevel gears, composed of a flying tourbillon, hours and minutes, a power reserve indicator and temperature measurement, developed in-house by MB&F.

Mechanical movement, manual winding (by turning the entire case clockwise).

Power reserve: 96 hours

Balance frequency: 18’000bph/2.5Hz

Plates: Blue and 5N PVD treatment

Number of movement components: 364 components

Number of jewels: 29 jewels


Hour and minutes

Power reserve

Temperature (-20 to 60° Celsius, or 0 to 140° Fahrenheit)


Grade 5 titanium

Display markers: conical rods in stainless steel (Ø 0.50mm to 0.60mm), darker beads in polished titanium and lighter beads in polished aluminium (Ø 1.30mm to 2.40mm).

Dimensions: 42mm diameter x 23mm height

Number of case components: 92 components

Water resistance: 20m / 68’ / 2ATM

Sapphire crystals

Sapphire crystals on top, back, and on each chamber-display treated with anti-reflective coating on both faces

Sapphire crown

Strap & Buckle

Rubber strap – white for the blue model and khaki green for the red gold model

Titanium tang buckle.



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