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The Encyclopedia of Horology

Serial-number guide

General note — Swiss houses without a public serial table Serial Numbers

Needs research

What a General note — Swiss houses without a public serial table serial number can establish, what it cannot, and how to record a date estimate another researcher could check.

Diagram

maker or gradeserialcase hallmarksimport and assay marks
Schematic: where markings are found. An outline schematic drawn to show the arrangement of the parts discussed here. It is not a dimensioned working drawing and does not depict a particular maker's calibre.

Method

Reading the number, step by step

  1. 1. Find the movement number

    The general caution applying across nearly all Swiss manufacturers holds here too: movement and case numbers are typically independent series, and an archive extract (where offered) is usually keyed to one specific number, most often the movement number — confirm which number the manufacturer's service actually uses before submitting a request.

  2. 2. Understand what it encodes

    Where no public table exists, a movement or case number is only as useful as the manufacturer's own record-keeping; without an official extract, publicly circulated numbers for such houses (where they exist at all) should be treated as unverified estimates at best.

  3. 3. Judge how precise the date can be

    Needs-research by default for any Swiss house not otherwise covered in this dataset: first establish whether the manufacturer still exists and offers an archive or heritage-extract service, then use that service as the only genuinely verified route; absent that, treat any public number-dating claim as an estimate.

  4. 4. Check the records behind the tables

    Most Swiss watch houses never published, and do not maintain publicly, a serial-to-year lookup table of the kind common among the major American pocket-watch factories; for the majority of Swiss manufacturers, obtaining a documented production date requires requesting a paid archive extract directly from the manufacturer (where the company still exists and retains records), rather than consulting a public chart. Manufacturers known to maintain and offer such a service, referenced elsewhere in this dataset, include Omega (Extract from the Archives / Vintage Certificates), Patek Philippe (Extract from the Archives) and Longines (Extract from the Archives); other houses may offer comparable services, but this should be confirmed directly with the manufacturer rather than assumed.

Quick facts

Manufacturer
General note — Swiss houses without a public serial table
Dating confidence
Estimate only — see notes
Editorial status
Needs research

Sources & references

  1. Manufacturer-published information on archive/heritage extract services (Omega, Patek Philippe, Longines, as referenced elsewhere in this dataset)

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 General note — Swiss houses without a public serial table watch?
The general caution applying across nearly all Swiss manufacturers holds here too: movement and case numbers are typically independent series, and an archive extract (where offered) is usually keyed to one specific number, most often the movement number — confirm which number the manufacturer's service actually uses before submitting a request.
What do General note — Swiss houses without a public serial table serial numbers mean?
Where no public table exists, a movement or case number is only as useful as the manufacturer's own record-keeping; without an official extract, publicly circulated numbers for such houses (where they exist at all) should be treated as unverified estimates at best.
How accurate is dating a General note — Swiss houses without a public serial table watch by serial number?
Needs-research by default for any Swiss house not otherwise covered in this dataset: first establish whether the manufacturer still exists and offers an archive or heritage-extract service, then use that service as the only genuinely verified route; absent that, treat any public number-dating claim as an estimate.
Where are General note — Swiss houses without a public serial table production records held?
Most Swiss watch houses never published, and do not maintain publicly, a serial-to-year lookup table of the kind common among the major American pocket-watch factories; for the majority of Swiss manufacturers, obtaining a documented production date requires requesting a paid archive extract directly from the manufacturer (where the company still exists and retains records), rather than consulting a public chart. Manufacturers known to maintain and offer such a service, referenced elsewhere in this dataset, include Omega (Extract from the Archives / Vintage Certificates), Patek Philippe (Extract from the Archives) and Longines (Extract from the Archives); other houses may offer comparable services, but this should be confirmed directly with the manufacturer rather than assumed.

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