Where is the serial number on a Longines watch?

As with most manufacturers of this period, case and movement numbers are separate; the Longines archive service is generally keyed to the movement number.

What do Longines serial numbers mean?

The movement number is the primary key into Longines's own archive; the certificate service can confirm recorded manufacture date, model/calibre and, in some cases, original shipping destination.

How accurate is dating a Longines watch by serial number?

Verified when obtained via the official archive certificate; estimated when relying on public serial-range charts.

Where are Longines production records held?

Longines maintains a historical archive and offers an 'Extract from the Archives' certificate service referencing original movement-based production records, one of the more accessible manufacturer archive services in the industry.

Longines Serial Numbers — How to Read and Date Them

Method

Reading the number, step by step

1. Find the movement number
As with most manufacturers of this period, case and movement numbers are separate; the Longines archive service is generally keyed to the movement number.
2. Understand what it encodes
The movement number is the primary key into Longines's own archive; the certificate service can confirm recorded manufacture date, model/calibre and, in some cases, original shipping destination.
3. Judge how precise the date can be
Verified when obtained via the official archive certificate; estimated when relying on public serial-range charts.
4. Check the records behind the tables
Longines maintains a historical archive and offers an 'Extract from the Archives' certificate service referencing original movement-based production records, one of the more accessible manufacturer archive services in the industry.

Quick facts

Manufacturer: Longines
Dating confidence: Estimate only — see notes
Editorial status: Partially verified

Sources & references

Longines, published information on the Extract from the Archives service

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

Limits

What the number does not prove

Do not assume a case with a Longines-style signature but no verifiable Longines movement number is authenticated by the case alone.
Do not treat 'shipped to market X' information, where the archive provides it, as proof the watch has remained in that market since — ownership history is a separate research question.

Questions

Frequently asked

Where is the serial number on a Longines watch?: As with most manufacturers of this period, case and movement numbers are separate; the Longines archive service is generally keyed to the movement number.
What do Longines serial numbers mean?: The movement number is the primary key into Longines's own archive; the certificate service can confirm recorded manufacture date, model/calibre and, in some cases, original shipping destination.
How accurate is dating a Longines watch by serial number?: Verified when obtained via the official archive certificate; estimated when relying on public serial-range charts.
Where are Longines production records held?: Longines maintains a historical archive and offers an 'Extract from the Archives' certificate service referencing original movement-based production records, one of the more accessible manufacturer archive services in the industry.

Continue

Longines Serial Numbers

Longines movement markings

Reading the number, step by step

1. Find the movement number

2. Understand what it encodes

3. Judge how precise the date can be

4. Check the records behind the tables

Quick facts

Sources & references

What the number does not prove

Frequently asked

Other serial-number guides