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The L.Leroy Osmior Bal du Temps is a limited-production mechanical watch introduced for the brand’s 240th anniversary and presented at Geneva Watch Days 2025. It pairs a flying tourbillon with an on-demand minute repeater in a 43 mm case, and comes in 18K 5N red gold, platinum or grade 5 titanium. Its single central hand shows the hours; the repeater sounds the hours, quarters and minutes.
What is the L.Leroy Osmior Bal du Temps?
The Bal du Temps is a specific model in L.Leroy’s Osmior collection, not simply the name of a collection. The brand introduced it in its 240th-anniversary year, and it was presented at Geneva Watch Days 2025. Launch coverage describes it as limited production, but does not state an edition size. Timekeepers Club and Europa Star reproduce the launch specifications and announcement.
Its two principal complications are a flying tourbillon, visible at six o’clock, and a minute repeater. The open dial displays the movement; a single central hand indicates the hours against a peripheral hour ring. There is no conventional minute hand, so the repeater provides the minutes acoustically when activated.
How the minute repeater and tourbillon work
Minute repeater
On demand, the repeater chimes the hours, then the quarters, then the remaining minutes. The watch uses two gongs, and the hammers can be seen through the sapphire caseback. This makes the repeater both an audible time display and a visible part of the mechanism. The technical description is reported by Monochrome Watches.
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#1 Best Overall
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Flying tourbillon
The flying tourbillon sits at six o’clock. Product specifications describe its cage as having 76 parts and completing one rotation per minute. Those are published specification figures, not independently measured performance results.
References and case differences
The three identified references share a 43 mm case diameter. Their principal distinction is case material, with dial colors reported to vary by version. Coverage does not provide comparative weights or acoustic measurements.
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| Reference | Case material | Reported dial tone |
|---|---|---|
| LL305/1 | 18K 5N red gold | Anthracite and gilt |
| LL306/1 | Platinum | Light blue and white |
| LL307/1 | Grade 5 titanium | Silver and black, with a blue hand |
The color descriptions come from Monochrome Watches; confirm the actual appearance and reference with a seller when considering a specific example.
Movement and published specifications
The movement is reported as hand-wound calibre L601SQ. Specialist coverage lists 321 components, 29 jewels, a frequency of 21,600 vibrations per hour (3 Hz), one barrel and a stated 90-hour power reserve. These are published product specifications rather than the results of an independent test. The reviewed coverage does not identify the movement’s maker or partner.
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- STUNNING BLUE DIAL: this automatic men's watch features a deep blue, pressed pattern and gloss finish surrounded by a stainless steel watch case
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| Specification | Published detail |
|---|---|
| Case diameter | 43 mm |
| Thickness | 13.60 mm including the domed sapphire in launch text reproduced by Europa Star; other coverage reports 13.8 mm |
| Movement | Hand-wound calibre L601SQ |
| Components and jewels | 321 components; 29 jewels |
| Frequency | 21,600 vibrations per hour (3 Hz) |
| Power reserve | 90 hours, stated |
| Water resistance | 3 ATM / 30 m |
| Strap | Black alligator leather, with a folding clasp matching the case |
The thickness differs across published descriptions: launch text reproduced by Europa Star gives 13.60 mm including the domed sapphire, while other coverage gives 13.8 mm. The available sources do not explain the discrepancy. The 30 m rating is a specification, not a recommendation for swimming.
One complication in the reporting is a conflicting calibre label: a Time+Tide specification table prints “L610AQ,” while its article narrative and other technical coverage identify L601SQ. The more consistently corroborated designation is L601SQ; the discrepancy is documented in Time+Tide’s coverage.
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- WATER RESISTANT MEN'S WATCHES: Up to 50m (165ft); wearable for short periods of recreational swimming and showering, but not diving or snorkeling; 5 ATM
Price and availability
L.Leroy lists the price as on request in the reviewed launch coverage, and the exact production quantity is not stated. Monochrome Watches estimates EUR 200,000–300,000, but that is the publication’s estimate, not a confirmed manufacturer price. A 2025 report of availability does not establish current stock in October 2026; ask a verified dealer or the brand for a current offer and delivery timing.
Quick Recap
Best Value
- DAY/DATE CALENDAR: stay organized with the convenient day/date calendar displayed on the beautiful blue dial
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What to consider before choosing a version
- Case material: Choose among red gold, platinum and grade 5 titanium based on your material preference; the sources provide no comparative weight figures.
- Dial appearance: The reported tones differ among references, but confirm the specific watch’s dial and hand colors with the seller.
- Fit: All three references are reported at 43 mm across, with published thickness figures ranging from 13.60 to 13.8 mm.
- Price and stock: Request a current quote and confirm that the seller has the exact reference available; neither a public list price nor current stock is established in the reviewed coverage.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
