The L.Leroy Vox Temporis is not interested in being read like an ordinary watch.
Instead, it separates the act of knowing the time into two experiences, with the hours shown visually and the precise minutes delivered by sound through a minute repeater.
It’s a fittingly unusual piece from the Osmior collection, one that connects an historic tactile watch concept with a contemporary hand-wound movement, a flying tourbillon and a striking mechanism.
At a glance
- The L.Leroy Vox Temporis combines a rotating dial, fixed arrow-shaped hour hand, minute repeater and flying tourbillon.
- The watch is inspired by an 1810 L.Leroy tact watch made for the Prince of Hesse, now preserved at the Patek Philippe Museum.
- Production is limited to 15 pieces across red gold, platinum and Grade 5 titanium, with prices from CHF 265,000.
A rotating dial with a voice
The name Vox Temporis translates from Latin as “Voice of Time”, and the watch takes that idea quite literally.
There are no conventional minute markers and no logo interrupting the dial, only a radial guilloché flinqué pattern beneath translucent varnish.
The arrow-shaped hour hand remains fixed at the periphery, while the dial rotates underneath it to indicate the hours.
For the quarter-hours and minutes, the wearer activates the minute repeater using the slide integrated into the case band between 8:30 and 9:30.
The mechanism then strikes the hours, quarter-hours and minutes on two gongs, using two hand-finished hammers visible through the sapphire caseback.
From tact watch to contemporary complication
The intellectual starting point is an L.Leroy tact watch made in 1810 for the Prince of Hesse.
That historic piece allowed the owner to read the hours and half-hours discreetly by touch, using diamonds and pearls arranged around the case.
At a time before electric lighting, this was not merely a flourish but a practical alternative to reading a dial in the dark.
The Vox Temporis updates that fascination with non-standard time reading through sound and motion rather than touch.
It also sits in a broader line of contemporary L.Leroy work concerned with alternative ways of experiencing time, including the Bal du Temps model from 2025.
An Officer-style case with three personalities
The 43 mm Officer-style case is offered in 18-carat 5N red gold, platinum or Grade 5 titanium.
It measures 14.74 mm thick including the front crystal and hinged rear cover, with a polished domed bezel, fluted crown and sapphire crystals front and back with anti-reflective treatment.
The hinged protective cover nods to pocket-watch construction and can be personalised on request.
Beneath it, the sapphire display back reveals a rear crystal ring combining polished surfaces, sandblasted sections, polished relief engravings and six visible fixing screws carrying the model identification details.
Each version has a distinct dial and hand pairing.
- Reference LL301/1 in 18-carat 5N red gold has an anthracite dial with a gilded hour hand.
- Reference LL302/1 in platinum pairs a blue dial with a silver-toned hand.
- Reference LL303/1 in Grade 5 titanium uses a silver dial with a blue hand treated by ALD technology.
All three are fitted with alligator leather straps in black, dark navy blue or brown, secured by a matching open-worked folding clasp with L.Leroy’s interlaced double-L emblem.
The L601SQR calibre
Inside is the hand-wound L601SQR calibre, developed and manufactured in Geneva exclusively for L.Leroy.
The movement comprises 321 components and 29 jewels, runs at 21,600 vibrations per hour, and offers a 90-hour power reserve from a single barrel.
Its regulating organ uses a variable-inertia balance wheel, flat balance spring and Swiss lever escapement.
The flying tourbillon is composed of 76 parts and completes one rotation per minute.
Because it is supported from below without an upper bridge, the cage appears suspended within the movement.
Finishing is treated as part of the architecture, with a single rhodium-plated bridge, frosted decoration, hand-finished bevels, polished screw heads and mirror-polished repeater hammers.
Details & Specifications
| Brand | L.Leroy |
|---|---|
| Model | Vox Temporis |
| Collection | Osmior |
| References | LL301/1, LL302/1, LL303/1 |
| Case size | 43 mm |
| Case thickness | 14.74 mm including front crystal and hinged back cover |
| Case materials | 18-carat 5N red gold, platinum or Grade 5 titanium |
| Dial | Radial guilloché flinqué with translucent varnish |
| Movement | Hand-wound L601SQR calibre |
| Components | 321 components |
| Jewels | 29 jewels |
| Frequency | 21,600 vibrations per hour, 3 Hz |
| Power reserve | 90 hours |
| Complications | Minute repeater and flying tourbillon |
| Water resistance | 3 ATM |
| Strap | Alligator leather in black, dark navy blue or brown |
| Production | Limited edition of 15 pieces total across the three case materials |
| Prices | CHF 265,000 in Grade 5 titanium, CHF 290,000 in 18-carat 5N red gold, CHF 320,000 in platinum |
The Vox Temporis has been nominated in the Artistic Crafts category of the 2026 Grand Prix d’Horlogerie de Genève, with the awards ceremony scheduled to take place in Geneva on 7 November 2026.
For collectors drawn to watches that rethink the basic ritual of reading time, this is less a conventional grand complication than a deliberately poetic instrument, one that asks the wrist to listen as much as it looks.
