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The Encyclopedia of Horology

Serial-number guide

Patek Philippe Serial Numbers

Partially verified

What a Patek Philippe serial number can establish, what it cannot, and how to record a date estimate another researcher could check.

Patek Philippe movement markings

Patek Philippe & Co. Yellow Gold Pocket Watch – Circa 1920
Patek Philippe & Co. Yellow Gold Pocket Watch – Circa 1920 — WatchMuseum.org, © WatchMuseum.org, used with permission. WatchMuseum.org catalogue record
Patek Philippe & Co. Yellow Gold Pocket Watch – Circa 1920
Patek Philippe & Co. Yellow Gold Pocket Watch – Circa 1920 — WatchMuseum.org, © WatchMuseum.org, used with permission. WatchMuseum.org catalogue record
Patek Philippe & Co. Yellow Gold Pocket Watch – Circa 1920
Patek Philippe & Co. Yellow Gold Pocket Watch – Circa 1920 — WatchMuseum.org, © WatchMuseum.org, used with permission. WatchMuseum.org catalogue record

Movement markings — maker name, grade, serial number and jewelling — are the evidence base for any serial-number attribution.

Method

Reading the number, step by step

  1. 1. Find the movement number

    Explicitly separate series by design at Patek — this is a case where the movement-vs-case distinction is a defining feature of the manufacturer's own record-keeping, not just a general watch-identification caution.

  2. 2. Understand what it encodes

    Patek Philippe uses distinct movement and case number series; an Extract from the Archives can confirm the recorded original configuration (case type, dial, complications, original retailer/market where recorded) for a given case or movement number.

  3. 3. Judge how precise the date can be

    Verified when obtained directly from Patek Philippe's archive service; treat any third-party public serial chart as an approximate secondary aid only.

  4. 4. Check the records behind the tables

    Patek Philippe maintains its own archives and offers an Extract from the Archives service referencing the company's original production records for both movement and case numbers, which are separately numbered in Patek's system.

Quick facts

Manufacturer
Patek Philippe
Dating confidence
Estimate only — see notes
Editorial status
Partially verified

Sources & references

  1. Patek Philippe, published information on the Extract from the Archives service
  2. Patek Philippe Museum, published company history

Where sources disagree, the disagreement is stated rather than resolved silently.

Limits

What the number does not prove

Questions

Frequently asked

Where is the serial number on a Patek Philippe watch?
Explicitly separate series by design at Patek — this is a case where the movement-vs-case distinction is a defining feature of the manufacturer's own record-keeping, not just a general watch-identification caution.
What do Patek Philippe serial numbers mean?
Patek Philippe uses distinct movement and case number series; an Extract from the Archives can confirm the recorded original configuration (case type, dial, complications, original retailer/market where recorded) for a given case or movement number.
How accurate is dating a Patek Philippe watch by serial number?
Verified when obtained directly from Patek Philippe's archive service; treat any third-party public serial chart as an approximate secondary aid only.
Where are Patek Philippe production records held?
Patek Philippe maintains its own archives and offers an Extract from the Archives service referencing the company's original production records for both movement and case numbers, which are separately numbered in Patek's system.

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