Aeterna

Aeterna · Geneva · Since 1948

Everything in its place.

Three hundred and twelve parts, assembled at four benches by the four people who drew them. One movement, twelve references, and then the tooling is retired.

Explore the collection Discover the house

Chronographe 312

Twelve ways to wear one idea.

Titanium, rose gold or king gold. Twelve dials. The same calibre in every one.

See all twelve How one is built

Aeterna · Geneva · Since 1948

Everything in its place.

Three hundred and twelve parts, one movement, twelve references. Each watch numbered, and then no more.

Explore the collection Discover the house

The collection

All twelve references

The house

One room, four benches, since 1948.

Loose components laid out on the black marble bench before assembly The Calibre 312 movement seated in its case, bridges and wheels exposed The finished Chronographe 312 resting on the bench

01 — The room

We never opened a second workshop.

Every Calibre 312 is assembled, adjusted and signed at one of four benches on the first floor of a building in Plainpalais. The same four watchmakers have done it since the calibre was drawn. When one of them retires, the person who replaces them spends two years at the next bench first.

02 — The movement

Eleven revisions, and every one removed something.

The movement was drawn in 1998 and has been revised eleven times. Nothing has ever been added. Each revision took out a part or replaced two with one, which is how a chronograph with this many functions still runs seventy-two hours on a single barrel.

03 — The edition

Three hundred and twelve, and then the tooling is retired.

Three hundred and twelve pieces across twelve references. We publish the register, so an owner can see exactly which of the 312 they hold and who assembled it. When the last one ships the tools come off the line and the reference closes.

Craftsmanship

Eight parts you can name.

A watch is not a mystery. It is a short list of components, each doing exactly one job. Here is the list, and what each one is for.

01

Case

44 mm, milled from a solid billet in eleven operations. Titanium, rose gold or king gold.

02

Dial

Open worked rather than printed, so the bridges below become the pattern you read the time against.

03

Hands

Cut, chamfered and polished by hand. Nine minutes of finishing each, on a part that weighs less than a grain of rice.

04

Movement

Calibre 312. Hand wound, 4 Hz, seventy-two hours, 312 parts and 37 jewels.

05

Crystal

Sapphire front and back, anti reflective on both faces, so there is no blue cast and nothing to hide behind.

06

Crown

The only part you touch every day. Knurled to grip with dry hands and sealed to a hundred metres.

07

Strap

Alligator over vulcanised rubber. It takes sweat and salt water, and it is cut for your wrist, not a size chart.

08

Finishing

Every bridge edge chamfered and black polished. Thirty one hours on surfaces most owners will never see.

Watch one being built

The twelve references

The same 312 parts, twelve ways to wear them.

One movement in all twelve. The case sets the price and the edition size, so the register runs by metal: nine titanium, two rose gold, one king gold.

Titanium

Nine references · 26 pieces each · 234 of 312

$18,500 delivered

Rose gold

Two references · 34 pieces each · 68 of 312

$34,000 delivered

  • AE-R01

    Forest

    Forest green

    Rose gold, forest green, and nothing else in the room.

    Green alligator over green rubber, rose gold folding clasp

  • AE-R02

    Umber

    Burnt umber

    The quietest way to wear gold.

    Brown alligator over taupe rubber, rose gold folding clasp

King gold

One reference · 10 pieces · 10 of 312

$41,000 delivered

AE-K01

Sovereign

Gold skeleton on blue

Ten pieces. The only king gold we cast.

Blue alligator over navy rubber, king gold folding clasp

Final 2 of 10

9 × 26  +  2 × 34  +  1 × 10

312pieces in total, each one numbered, and then the register closes.

Compare all twelve

Ownership

What comes with the watch.

Six commitments, printed on the certificate the day your watch ships. None of them expire when the warranty does.

Five-year warranty

Transferable with the watch, covering the movement and the case. Every service includes a full case refinish at no charge, for life.

Numbered and registered

Your serial is recorded in the house register, which we publish. Provenance never depends on a piece of paper you have to keep safe.

Secure payment

Card details go straight to our payment provider over an encrypted connection. We never see a card number and we never store one.

Insured delivery, duties paid

Free worldwide, fully insured, signed for by you or by nobody. Duties and taxes are in the price. Nothing is added at the door.

Thirty days to change your mind

Wear it. If it is not the watch you hoped for, send it back inside thirty days for a full refund. No restocking fee, no explanation needed.

A person, not a queue

One watchmaker is assigned to your reference and stays with it for as long as you own the watch. You get their name and their direct line.

Owners

What owners say.

4.8 from 118 verified owners
I asked three questions before I bought and got three straight answers, including one that talked me out of the more expensive case. That is when I ordered.
Dr. Halvard Reinert Owner, No. 041 — Umber — Verified purchase
Five months is a long wait and they never once pretended otherwise. Photographs from the bench at three stages, then a phone call the day it was cased.
Mariam Oyelaran Owner, No. 187 — Lagoon — Verified purchase
Four years on it has been serviced once. It came back looking like the day it arrived and the invoice matched the figure printed on the certificate in 2022.
Tobias Lindqvist Owner, No. 009 — Sovereign — Verified purchase

Journal

From the bench.

All entries

The register

Two letters a year.

When a reference is finished we write once. When the register closes we write again. Nothing else, ever, and one click removes you.

Demonstration site: nothing is sent and no address is stored.