Name: MB&F Legacy Machine Flying T LM FlyingT
Brand: MB&F
SKU: LM FlyingT

MB&F solved a real problem with the Flying T: when your arm is at rest, a conventional dial is tilted away from you. The LM FlyingT tilts the time display 50 degrees toward the wearer, so reading the watch in the natural raised-arm position requires no awkward wrist rotation. It is clever without being theatrical, and at 38.5mm in titanium it is one of the few MB&F pieces that sits quietly on a smaller wrist.

What it is

The LM FlyingT debuted in 2019 as the smallest watch in the Legacy Machine family, developed by MB&F with independent watchmaker Stephen McDonnell. The tilted-dial concept draws on the ergonomics of how a watch is actually worn: the time display is oriented 50 degrees from horizontal so it faces the wearer directly when the arm is raised to reading position. McDonnell built the movement to place the flying tourbillon at the top of the dial architecture, where it acts as both a regulator and a visual anchor.

The case is titanium throughout, keeping weight low on what MB&F positioned as a more wearable entry point into the Legacy Machine line. It remains in regular production, one of the brand's more consistent catalog anchors.

Buying notes

The tilted display is genuinely functional, but it takes a few days of wear before reading the time stops feeling slightly foreign. Buyers who handle one at a boutique for five minutes sometimes underestimate the adjustment period. The flying tourbillon is exposed and positioned high on the dial, making crystal integrity worth inspecting closely on any pre-owned example.

Titanium cases scratch readily and MB&F's finishing is detailed enough that surface wear is visible earlier than on brushed steel alternatives. The 38.5mm diameter suits many wrists, but the case height is substantial due to the tilted movement architecture, so check wrist clearance before committing. Service intervals and costs are in line with other McDonnell-caliber pieces: budget accordingly and plan on authorized service only, as independent access to parts is limited.

Market read

New retail pricing has climbed since launch, and pre-owned examples now trade close to or at retail depending on condition and dial variant. The titanium case does not hold collector premium the way precious metal versions might, but it also keeps the entry price lower in absolute terms. Demand is steady rather than speculative, which means you are unlikely to find a panicked seller, but also unlikely to find one priced well below market.

Boutique-sourced examples with full paperwork command a meaningful premium over grey-market stock.

Service expectations

The LM FlyingT runs the caliber HMX, a manual-wind movement developed with Stephen McDonnell featuring a flying tourbillon and the signature tilted-disc time display. Service should be performed by MB&F directly or by an authorized partner with access to genuine caliber HMX parts. The tourbillon cage and tilted display mechanism require specialist handling that goes beyond standard complications.

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.

Common#3 in familyOfficial press photos

Live pricing is coming soon. Get notified when it is available for this reference.

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

Versatile size: fits most wrists (6–7.5 in / 15–19 cm)

38.5 mm case. The sweet spot for the broadest range of wrist sizes. Neither too dainty nor too bold.

Not yet rated

Community + OSINT signals haven’t landed for this reference yet. We don’t publish a rating against zero signal: the number would mean nothing. Editorial body + caliber + market value still surface above; ratings appear once the signal corpus does.

Search pre-owned listings

Chrono24

eBay (sold listings)

WatchBox

Authentication

The central tourbillon must complete exactly one rotation per minute and the peripheral hour ring must advance in steps, not continuously.

Known issues in the market

The vertical tourbillon is the identity marker; any LM Flying T where the central element is not a tourbillon cage is non-genuine.
Peripheral hour ring must step, not sweep continuously.

Area	What to check	What is correct	Red flag
movement	Vertical tourbillon one-minute rotation	Tourbillon cage completes exactly one rotation per minute	Non-one-minute rotation; damaged tourbillon or non-genuine watch
dial	Peripheral hour ring advancement	Peripheral hour ring advances in steps at each hour; not continuous sweep	Continuous sweep of hour ring; mechanism fault or non-genuine configuration
movement	LM FlyingT caliber architecture	Movement architecture consistent with LM FlyingT specification	Non-LM-FlyingT architecture; movement swap

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 FlyingT is the only LM designed specifically for women: a 38.5mm case with a vertical flying tourbillon at 6 o'clock and hours displayed via a rotating disc. The case is white gold or platinum. No replica exists.

Known reproduction risks

toggle

LOW

No known replica. The combination of flying tourbillon, hour-disc display, and suspended LM balance wheel in a single 38.5mm case is mechanically impossible to approximate outside MB&F.

Any FlyingT with a traditional hour hand is not authentic
Case in steel or titanium has not been produced; gold and platinum only

Gem-set versions require gemological verification of stone quality and setting consistency.

Dial variants by era

toggle

Era	Description	Identifiers
2019 to present	Vertical flying tourbillon at 6 o'clock with the tourbillon cage visible in a large aperture. Hours displayed on a disc at 12 o'clock; Roman numerals on the chapter ring. Case in white gold or platinum with gem-set options.	Flying tourbillon cage at 6 o'clock without any bridge above it Hour-disc rotation display at 12 o'clock LM balance wheel suspended at 12 o'clock on an arch bridge above the hour disc 38.5mm case diameter; 20mm height White gold or platinum only

Service part flags

toggle

Flying tourbillon cage

Original: The tourbillon cage rotates once per minute and is fully visible from the dial side with no bridge above it. The cage construction is entirely in-house by MB&F and McDonnell.

Replacement tells

Bridge structure above the tourbillon cage (not present on genuine FlyingT)
Tourbillon cage with asymmetric or rough titanium construction
Tourbillon not completing one rotation per minute

Hour disc

Original: The hour display is a rotating disc, not a traditional hand. The disc shows current hour in an aperture at 12 o'clock and advances in one-hour steps.

Replacement tells

Hand-based hour display instead of disc
Disc with printing inconsistencies or misaligned numerals

Case back markings

toggle

2019 to present

MB&F engraving with LM FlyingT reference
Individual serial number
750 (18k gold) or PT950 (platinum) material mark
30m water resistance

Movement tells

toggle

The flying tourbillon should operate without any binding or irregular rotation; a tourbillon that pauses or accelerates during its one-minute cycle indicates a service issue.
The hour disc should advance cleanly in one-hour steps, not drift or stall mid-advancement.
MB&F service documentation should specify which generation of the FlyingT caliber is installed.

Sources: MB&F official.