Where is the serial number on a Seth Thomas Clock Company watch?

For clocks, the equivalent distinction is between the movement and the case/cabinet: Seth Thomas cases were often supplied or finished separately from the movement inside, and a label inside a case documents the case/cabinet retailer information, not necessarily the movement's exact production date.

What do Seth Thomas Clock Company serial numbers mean?

Where present, a movement's model or pattern designation identifies the clock movement type; NAWCC-affiliated researchers have documented some Seth Thomas date-coding and model-numbering conventions, but coverage varies by product line and period, and a simple year-lookup table of the kind published for Waltham or Elgin pocket watches does not exist in the same form for Seth Thomas clocks generally.

How accurate is dating a Seth Thomas Clock Company watch by serial number?

Needs-research: identify the specific product line and movement type first (the company made shelf, wall, tower and other clock movements across a very long production history), then consult the specialist reference works and NAWCC resources specific to that line.

Where are Seth Thomas Clock Company production records held?

Seth Thomas was primarily a clock manufacturer, and clock movement dating conventions differ from the pocket-watch serial tables discussed elsewhere in this list; some Seth Thomas movements carry a stamped date code or model/pattern number rather than a simple sequential serial, and surviving factory documentation is partial.

Seth Thomas Clock Company Serial Numbers — How to Read and Date Them

Method

Reading the number, step by step

1. Find the movement number
For clocks, the equivalent distinction is between the movement and the case/cabinet: Seth Thomas cases were often supplied or finished separately from the movement inside, and a label inside a case documents the case/cabinet retailer information, not necessarily the movement's exact production date.
2. Understand what it encodes
Where present, a movement's model or pattern designation identifies the clock movement type; NAWCC-affiliated researchers have documented some Seth Thomas date-coding and model-numbering conventions, but coverage varies by product line and period, and a simple year-lookup table of the kind published for Waltham or Elgin pocket watches does not exist in the same form for Seth Thomas clocks generally.
3. Judge how precise the date can be
Needs-research: identify the specific product line and movement type first (the company made shelf, wall, tower and other clock movements across a very long production history), then consult the specialist reference works and NAWCC resources specific to that line.
4. Check the records behind the tables
Seth Thomas was primarily a clock manufacturer, and clock movement dating conventions differ from the pocket-watch serial tables discussed elsewhere in this list; some Seth Thomas movements carry a stamped date code or model/pattern number rather than a simple sequential serial, and surviving factory documentation is partial.

Quick facts

Manufacturer: Seth Thomas Clock Company
Dating confidence: Estimate only — see notes
Editorial status: Needs research

Sources & references

NAWCC published research on Seth Thomas Clock Company production and dating conventions

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

Limits

What the number does not prove

Do not assume a single universal Seth Thomas serial-to-year table exists in the way it does for the major pocket-watch factories — treat any such claimed table with caution and verify it is specific to the correct product line.
Do not treat a label glued inside a clock case as proof of the movement's date; labels documented case/cabinet supply and retailing, and cases were sometimes reused or replaced.

Questions

Frequently asked

Where is the serial number on a Seth Thomas Clock Company watch?: For clocks, the equivalent distinction is between the movement and the case/cabinet: Seth Thomas cases were often supplied or finished separately from the movement inside, and a label inside a case documents the case/cabinet retailer information, not necessarily the movement's exact production date.
What do Seth Thomas Clock Company serial numbers mean?: Where present, a movement's model or pattern designation identifies the clock movement type; NAWCC-affiliated researchers have documented some Seth Thomas date-coding and model-numbering conventions, but coverage varies by product line and period, and a simple year-lookup table of the kind published for Waltham or Elgin pocket watches does not exist in the same form for Seth Thomas clocks generally.
How accurate is dating a Seth Thomas Clock Company watch by serial number?: Needs-research: identify the specific product line and movement type first (the company made shelf, wall, tower and other clock movements across a very long production history), then consult the specialist reference works and NAWCC resources specific to that line.
Where are Seth Thomas Clock Company production records held?: Seth Thomas was primarily a clock manufacturer, and clock movement dating conventions differ from the pocket-watch serial tables discussed elsewhere in this list; some Seth Thomas movements carry a stamped date code or model/pattern number rather than a simple sequential serial, and surviving factory documentation is partial.

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Seth Thomas Clock Company Serial Numbers

Seth Thomas Clock Company 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