
Calibre AZ.01
Made to be looked into.
One movement, made by the house, for one case. Automatic, twenty-eight jewels, seventy-two hours. Finished on both sides because both sides can be seen.
- 28,800vibrations an hour
- 72hours of reserve
- 28jewels
- 186parts
- 4.2millimetres tall
Anatomy
The plan, from the dial side.
The dial lifts off and this is what is under it. Touch a number, or rest on one, to find the part.

Rest on a partTouch a number to read what it does.
- 01BarrelThe mainspring, 72 hours of it, under a brushed steel drum.
- 02Ratchet wheelWinds the barrel from the crown or the rotor, and holds it.
- 03Crown wheelTurns the ratchet when you wind by hand.
- 04Centre wheelOne turn an hour. The minute hand rides on it.
- 05Third wheelBetween the centre and the fourth, quietly gearing down.
- 06Fourth wheelOne turn a minute. The seconds hand rides on it.
- 07Escape wheelFifteen teeth. Half a tooth every beat, eight beats a second.
- 08BalanceThe heart. It swings 240 degrees each way, four times a second.
- 09JewelsTwenty-eight synthetic rubies, so steel never turns on steel.
- 10ScrewsBlued by heat, not by paint. Slotted, and polished flat.

Finishing
Every surface answers to a name.
- Geneva stripes
- On the bridges. Cut wet, at one angle, so the whole movement turns with one light.
- Perlage
- On the mainplate. Overlapping circles, laid by hand, under the parts nobody sees.
- Anglage
- The bridge edges bevelled at forty-five degrees and polished to a mirror.
- Blued screws
- Heated to the colour and no further. Slotted, then flat-polished.
- Engraved rotor
- Open-worked, so it hides nothing, and engraved on its underside.
Caseback
Engraved by number.
A sapphire window, with the calibre, the water rating and the watch's own number cut into the steel around it. The number is the house's memory: it names the movement, the hands that regulated it, and the day it left.
Regulated in six positions, over fifteen days, to run within four seconds a day. Then it is cased, and then it is yours.

See it run.
The movement is best understood on the wrist, at a viewing. The house brings a loupe.