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In-house manufacture caliber
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.
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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.
Sources: MB&F official.






