Côtes de Genève
Parallel waves, 1.8 millimetres apart, cut across every bridge in one pass so the stripes run unbroken from part to part.
MAISON OSSEL · LE BRASSUS · REF. OS-01
The movement beats 28,800 times an hour.
Eight beats a second.
Ossel Battement. A hand-wound calibre you can hear, cased in Grade 5 titanium. Eighty-eight pieces.
Cut along its horizon.
The dial is split by a single line. Above it: lacquer the colour of a blued screw, brushed into a sunray, with two applied indices and our name, nothing else. Below it: smoked sapphire, so the balance beats at six o’clock, in plain sight. The line carries on around the caseband as one machined groove we call the meridian.
- Ø 39.5 MM
- 10.4 MM
- MERIDIAN GROOVE · 0.4 MM
- CROWN · 20 TEETH, CUT TO THE ESCAPE WHEEL’S PROFILE
- LUGS · 20 MM
The small seconds at nine steps eight times a second. Its track is divided to match.
Follow the torque.
Energy enters at the crown and leaves, eight times a second, at the balance. Scroll, and we’ll take the movement apart in the order the energy travels.
- 01 · CROWN · 15 T → 30 T → 90 T · 42 TURNS TO FULL
Every turn of the crown tightens the mainspring by a sixth of a barrel turn: one hour and twenty minutes of running. Count the clicks: fifteen a turn.
- 02 · BARREL · 80 T · 1 REV / 8 H · 56 H RESERVE
A blued spring, eleven coils, coiled in a drum. Seven turns hold fifty-six hours.
- 03 · CENTRE WHEEL · 80 : 10 → ×8 · 1 REV / H
Carries the minute hand. It turns once an hour, which is the whole point.
- 04 · THIRD WHEEL · 75 : 10 → ×7.5 · 8 REV / H
The quiet middle of the train. Nothing on the dial, everything in the ratio.
- 05 · FOURTH WHEEL · 96 : 8 → ×12 · 1 REV / MIN
Carries the seconds hand at nine. It moves only when the escapement lets it: eight small steps a second.
- 06 · ESCAPE WHEEL · 20 TEETH · 12 REV / MIN
Twenty club-shaped teeth, released half a tooth at a time. Nine degrees per beat.
- 07 · PALLET FORK + BALANCE · 4 HZ · 28 800 VPH
Two rubies lock and release the escape wheel; the balance swings 300 degrees and gives back what it borrowed. That is the tick.
Hover a ruby, or tab to one. Twenty-one of them; eleven you can see.
The heartbeat, slowed down.
A free-sprung balance, 8.6 millimetres across, with four inertia screws for regulation and a flat hairspring of thirteen turns. Scroll slowly and time slows with you, to an eighth of its speed. Stop, and it catches up.
TIME × 1.000AMPLITUDE 300°BEAT ERROR 0.4 MS28 800 VPH
Finished where no one will look.
Each calibre takes about 140 hours to finish and assemble.
Hand-finished. Under light, it tells you.
Perlage + anglage
Overlapping circles grained into the mainplate, and every bridge edge bevelled and polished by hand at forty-five degrees. Eleven inward angles, which no machine can reach.
Flame-blued screws
Fourteen steel screws heated over a flame until they turn blue at just under 300 °C, one at a time, by eye.
Specifications.
| Reference | OS-01 · Ossel Battement |
|---|---|
| Calibre | OS-01.4, manual winding, designed and finished in-house |
| Diameter / height | 30.0 mm (13¼‴) / 4.60 mm |
| Frequency | 28,800 vph (4 Hz) |
| Jewels | 21 |
| Power reserve | 56 hours |
| Escapement | Swiss lever, straight-line, 20-tooth club escape wheel |
| Balance | Free-sprung, Glucydur, 4 inertia screws, flat hairspring |
| Components | 138 |
| Finishing | Côtes de Genève, perlage, polished anglage, flame-blued screws |
| Functions | Hours, minutes, small seconds at 9 with an 8-step beat track; stop-seconds |
| Case | Grade 5 titanium, Ø 39.5 mm, 10.4 mm, polished bezel, brushed caseband with meridian groove |
| Crystals | Sapphire front, anti-reflective on both sides; domed sapphire caseback |
| Dial | Split horizon: navy sunray lacquer above, smoked sapphire below revealing the balance at 6; applied indices at 12 and 3 |
| Hands | Faceted skeleton steel; ruby-lacquered seconds tip |
| Water resistance | 50 m |
| Strap | Navy calfskin, titanium pin buckle; a second strap in grey woven silk |
| Edition | 88 pieces, numbered nn/88 on the caseback |
| Price | On request |
88.
Eight beats a second; eighty-eight pieces. Each is numbered on the caseback and assembled by one watchmaker from start to finish. When the eighty-eighth is cased, Calibre OS-01.4 is retired.
31 of 88 are allocated to private viewings this season.
Four watchmakers, one valley.
Maison Ossel was founded in 2014 in Le Brassus, in the Vallée de Joux, by Aurèle Ossel, Noémie Vuagniaux, Kenji Arata and Lucas Berney. We make one calibre at a time and fewer than a hundred watches a year. Battement is our third reference, and the first whose movement you can hear before you see it.
— Aurèle Ossel, watchmaker
See it in person.
Battement is shown by appointment, one guest at a time, with the watchmaker who assembled it. Tell us where and when.
Concept site by Fazed Digital. Maison Ossel is fictional: requests are not stored or sent anywhere.
Genève
Rue de la Cité 11, 1204 Genève
Tue–Sat 10:00–18:00
+41 22 310 88 01
Paris
7 rue Saint-Florentin, 75008 Paris
Tue–Sat 11:00–19:00
+33 1 42 60 88 02
Tokyo
5-4-8 Ginza, Chuo-ku, Tokyo 104-0061
Wed–Sun 11:00–19:00
+81 3 6264 8803
Atelier
Route du Risoud 14, 1348 Le Brassus
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