Written from the catalogue
The Journal
Reference pieces on movements, references and how watches work — each one built on figures from this library rather than compiled from elsewhere.
- 01Reference·Sep 5, 2026
Column Wheel, Cam, Clutch: How the Chronographs Here Actually Engage
A chronograph makes two decisions inside the case: what switches it on, and what couples it to the movement. The 3,400 chronograph watches in this library sort into four architectures, and the pusher tells you which.
- 02Reference·Sep 5, 2026
The Rolex 2236: The Most Common Movement in This Library
907 watches here run one 20 mm Rolex movement most enthusiasts have never looked at. It was also the first Rolex caliber with a silicon hairspring, nine years before a larger one got the same.
- 03Guide·Sep 5, 2026
The Datejust by Size: 28, 31, 36 and 41, and What Each Number Changes
2,184 Datejusts in this library divide by case size, and the size decides the movement inside, the shape of the reference number and how many variants exist. A guide to reading the family.
- 04Reference·Sep 5, 2026
Seven Days on One Barrel: IWC's Pellaton Winding
Twenty-two IWC calibers in this library hold exactly 168 hours — not 165, not 170. The number is that precise because the movement is stopped before the barrel actually runs out.
- 05Guide·Sep 5, 2026
What a Jewel Count Tells You, and What It Doesn't
941 calibers in this library record their jewel count, from 3 to 117. The number is a map of what the movement does, not a grade of how well it does it. How to read it.
- 06Reference·Sep 5, 2026
Master Chronometer: What METAS Tests, and the 694 Watches Here That Passed
Since 2015 Omega has had its cased watches certified against eight tests, including a 15,000 gauss magnetic field. Seventeen calibers and 694 watches in this library carry the certificate. What it measures, and what it does not.
- 07Reference·Sep 5, 2026
The Frédéric Piguet 1185: One Thin Chronograph Under an Audemars Piguet, a Vacheron and an Omega
A 5.5 mm column-wheel chronograph from 1987 sits under the Royal Oak Chronograph, the Overseas Chronograph and, in a larger form, 203 Omegas. Where it is in this library, and what each maison did with it.
- 08Reference·Aug 21, 2026
The Valjoux 7750 Family: One Movement, Four Maisons, 815 Watches
A cam-switched chronograph designed in 1973 to be cheap to build ended up inside Breitling, IWC, Omega and Panerai. Here is where it sits in our library, and what each maison changed.
- 09Guide·Aug 21, 2026
Variant Families: Why 11,394 Watches Here Are One of One
A reference and a variant are not the same thing, and the difference decides how rare a watch actually is. Across 17,435 watches, two thirds have no sibling at all.
- 10Guide·Aug 21, 2026
How to Read a Watch Reference Number
A reference number is not a serial number. On most maisons it encodes case metal, movement and dial — and once you can read it, a listing tells you far more than its photographs do.
- 11Reference·Aug 21, 2026
Rolex 3135 to 3235: What Actually Changed
Rolex replaced its core movement across the entire range between 2015 and 2023. The headline was a jump from 48 to 70 hours. The reason was a reshaped escapement — and the same change happened five more times, quietly.
- 12Reference·Aug 21, 2026
Patek Philippe's Caliber 240: The Micro-Rotor That Answered Quartz
Patek's response to the quartz crisis was not to compete on accuracy. It was to win on thinness — with a gold rotor sunk into the plate instead of sitting on top of it.
- 13Reference·Aug 21, 2026
The Lemania 2310: The Same Movement in a Patek and an Omega
One 1942 chronograph ébauche ended up under a Patek Philippe grand complication, a Vacheron Constantin perpetual calendar, and the watch worn on the Moon. Almost nobody outside watchmaking has heard of it.
- 14Reference·Aug 21, 2026
The ETA 2892: The Thin Base Everyone Builds On
Thirty-nine calibers in this library sit on one ETA movement. It is thinner than the alternative, which is the whole reason maisons stack their own work on top of it — including the escapement Omega spent thirty years defending.
- 15Reference·Aug 21, 2026
The Unitas 6497: A Pocket Watch Movement That Made Panerai Possible
Panerai's cases were too big for any wristwatch movement of the 1990s. The solution was to stop looking at wristwatch movements — and the choice still shapes how the brand's watches look.