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The Unworn Ledger

Read the market before the watch is worn

The unworn ledger: measurements before adjectives

This ledger covers the four things that decide what a pre-owned Swiss watch costs and what it really is. The first is the trade itself, and the pre-owned Swiss watch market explained in our market section is the part most buyers never read: how stock moves from dealers and auctions to private sellers, and why the words on a listing carry more weight than the photographs do.

The second is documentary. Anyone can learn to check a watch reference movement, a serial number and a service record, and the reference guides here show how each check is done and what each one cannot settle. The third is the houses: the brand directory collects the families that trade most often and says what each name stands for on the used market. The fourth is ownership, because storing, winding and travelling with a mechanical watch decide whether it runs on the morning you want to wear it.

Some references repay a longer read. The Rolex Datejust case and bracelet changed at least five times since 1945, and those changes are the fastest way to place an example in time before anyone quotes a price for it.

20 pages4 sections18 entries7 reference guides

An open watch showroom with pale wooden display cases along one wall, four people seated at a long desk with laptops and an open watch box, daylight coming through shop windows to the left, shot wide from standing height.
21/9Showroom floor of a watch business, seen wide. Look at the display cases and the desks: nothing here is offered for sale by this site. A trade showroom interior, no dealer or brand named. Illustration generated with AI.

The ledger in figures

  • 20Pages published
  • 4Sections
  • 18Entries in the ledger
  • 7Reference guides

The ledger, entry by entry

18 entries, dated to the day the sheet was read The brand directory

Each entry carries a ledger number, the day its bench sheet was read and three cotes. Entries are grouped by section, and where a figure is missing the missing figure is drawn as a blank rather than left out.

009Reference guides

A shallow wooden tray photographed from directly above, holding two tan leather watch cushions and a round watch on a brown leather strap, laid on rumpled linen in hard raking sunlight.

Reading a service record before a purchase

What a service record shows, what it omits, and how a buyer reconciles invoices, dates and movement condition before a purchase.

LW-00911/07/2026not published

No entry matches this filter.

The bench sheet, compared

4 references, 12 cotes, 4 blanks

Four references that buyers compare most often, measured on the same five lines. Where a house publishes no figure, the line is left as a drawn blank and the house is named.

Breitling Navitimer: the slide-rule chronograph

Slide-rule chronograph, read against its own line

Line introduced
1954
Power reserve, B01
70 h
Case diameter

Case diameter: no single figure is published for the line.

Omega Speedmaster across generations

One reference across its generations

Professional case
42 mm
Standard reference since
2014
Case thickness

Case thickness: not published for the line.

Rolex Datejust: case and dial changes

Case, bracelet and dial changes since 1945

Original case, 1945
36 mm
Lineup by 2019
28 to 41 mm
Case thickness

Case thickness: not published for the generation.

Cartier Tank Francaise: case proportions

Shaped case, read by proportion rather than by size

Case width, crown excluded
Lug to lug
Cartier publishes none of the figures this sheet asks for.

Cartier publishes none of the figures this sheet asks for.

Index of houses and references

12 letters, 18 entries

How this ledger is built

Every page here is written from pages that anyone can read: a house catalogue, a public entry on a reference, a dated invoice described in an article. Nothing is measured from a photograph, and nothing is copied from a listing.

What the ledger checks
A reference number, a case diameter, a calibre, a production year and the wording of a condition claim, each against a named public source.
What the ledger cannot check
The authenticity of an individual watch, the condition of a movement it has never seen, and the price a seller is asking this week.
What it does when a figure is missing
It draws the blank on the bench sheet and names the page that does not publish the figure. A gap that is shown can be asked about; a gap that is silent cannot.

The Unworn Ledger editorial team