Thomas Earnshow Chronometer Age Determination
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Thomas Earnshaw (1749-1829)
Thomas Earnshaw was a famous English watchmaker, known for marine chronometers and precision watches.
Clocks from his own workshop or his immediate surroundings date from approximately 1780-1830 .
Mark:
- Balance wheel with Earnshaw double compensation escapement (similar to chronometer-like)
- Hand-engraved serial number (not always sequentially documented)
- usually “Earnshaw London” on the dial or plate.
- solid brass or gold case , often in a wooden box (chronometer)
Serial numbers (works numbers, original time)
Original Earnshaw production is usually identified by 5- to 6-digit serial numbers , e.g.:
| Serial number | Estimated timeframe | type |
|---|---|---|
| 1–2000 | ca. 1780–1795 | early handcrafted production (rare) |
| 2000–5000 | ca. 1795–1810 | Chronometer/Precision Watches |
| 5000–9000 | ca. 1810–1830 | Later works by Earnshaw & Sons |
| >9000 | mostly successors / attributed works |
Option B – modern wristwatch
- Read the case back: ES code or limitation number.
- Google search for the code → You will immediately find the model presentation with the year of first release.
- Result: Production mostly between 2008 and 2023.
Example for orientation
| engraving | style | Period |
|---|---|---|
| Thomas Earnshaw London hand engraved, enamel dial | fine pocket watch | ca. 1790 – 1825 |
| Earnshaw Chronometer No. #### on brass case | Marine chronometer | ca. 1800 – 1830 |
| THOMAS EARNSHAW Automatic ES‑8001‑## | modern wristwatch | after 2010 |
Thomas Earnshaw was born on February 4 , 1749 , in Ashton-under-Lyne, England. In 1763, he completed an apprenticeship as a watchmaker. Earnshaw took over William Hughes 's business at 119 High Holborn in 1794/1795. From 1780 onward, he completed watches for Brockbanks .
In 1785, he established his own manufactory in London (High Holborn). Earnshaw produced marine and pocket chronometers, as well as pocket watches . He developed a spring-loaded chronometer escapement that remained standard for over 150 years. Earnshaw poached a key employee ( Mr. Lancaster ) from John Arnold , likely to learn more about his competitor. The robust Earnshaw watches quickly gained popularity in maritime circles.
Unfortunately, he did not win the British Longitude Prize of 1774. However , in 1805, he was awarded £3,000 for his efforts, with the support of the Astronomer Royal , Nevil Maskelyne . From this time onward, it became standard practice to store timepieces in lockable wooden boxes with gimbal suspension. His workshop produced approximately 3,000 pocket watches and about 1,500 marine and pocket chronometers of the highest quality.
Thomas married Lydea Theakston on March 27, 1769 , at St. James's Church, Westminster, London. Their children were Manasseh William, James, Thomas, and Elizabeth Ann. When Lydea died in 1801, Earnshaw moved with his four children from Kennington, London, to Greenford Hall in Greenford, Middlesex. The house would be his principal residence for the rest of his life, although he did not die there. In 1815 , he retired from managing the business, handing it over to his son Thomas.
Thomas Earnshaw died on March 1, 1829 , in Chenies Street, Bedford Square, London .
From 1815, Earnshaw's son , Thomas Earnshaw Jr., continued to run the company, although he did not manufacture chronometers himself. Thomas Jr. became a director at the British Watch and Clockmaking Company in 1842 .
Source: WatchWiki, AI
