Independent haute horlogerie · Genève

Time, taken seriously.

Two years of development, resolved into a single movement. The Calibre Æther — two hundred and thirty-one components, each finished by hand in a courtyard above the old town.

Calibre Æther 231 Réf. HG·01 4 Hz · 28,800 vph
The calibre

01 The Calibre

Calibre Æther 231

Macro photograph of the Calibre Æther movement — Geneva stripes, ruby jewels in gold chatons, blued screws Balance bridge · black-polished Ruby jewel · 31 total Côtes de Genève · hand-drawn

Assembled twice — once to prove it, once to keep it. Every bridge is bevelled by hand, every screw head heat-blued and its slot re-cut. The finishing you will never see is the finishing we care about most.

Components0
Power reserve0
Frequency0
Jewels0
Diameter31.0 mm
Height4.87 mm
BalanceGlucydur, free-sprung
FinishingAnglage · black polish

02 Tolerances

We measure our
patience in microns.

A movement is only as honest as its smallest gap. These are the numbers we hold ourselves to — checked, rejected, and checked again on the bench.

Pivot diameter tolerance ±0.000mm
Balance endshake 0.000mm
Beat error, dial up 0.0ms
Mean daily rate +0/−1s
Amplitude, full wind 0°
Anglage bevel angle 0°

03 The Collection

Two references.
Nothing spare.

Hæderus Æther Ultra-Plat — platinum case, porcelain enamel dial, blued Breguet hands on dark alligator HG·01

Æther Ultra-Plat

Platinum. Grand-feu porcelain dial fired four times, blued Breguet hands, hand-engraved chapter ring. 39 mm, and barely there on the wrist.

Case
950 platinum · 39 mm
Dial
Grand-feu enamel
Edition
Limited to 40

Price on request

Macro of a heat-blued screw and glowing ruby jewel on a hand-finished bridge of the Æther Squelette HG·02

Æther Squelette

The same calibre, opened to the light. Bridges skeletonised and hand-engraved over three hundred hours, so the mechanism keeps no secrets from its owner.

Case
18k white gold · 39 mm
Movement
Openworked Æther 231
Edition
Limited to 12

Price on request

04 The Atelier

Rue de la Cité,
Genève.

Above a quiet courtyard in the old town, eleven watchmakers keep an unhurried pace. We complete forty watches a year — not by constraint, but because that is how long it takes to do it properly.

There is no assembly line here. A single watchmaker follows a movement from the first bridge to the final regulation, signs the balance cock, and hands it on only when it keeps the time we promised.

11Watchmakers
40Watches a year
2009Established
100%Finished in-house