Pocket Watch Rare Silver Duplex Escapement English Hallmark 1828
USD 1172.85 USD
Specifications
| Movement | Mechanical (Manual) |
| Closure | Open Face |
| Indices | Roman Numerals |
| Dial Colour | White |
| Year Manufactured | 1820-1829 |
| Vintage | Yes |
| Brand | Hallmark |
| Department | Men |
| Type | Pocket Watch |
| Case Colour | Silver |
| Caseback | Solid |
| Escapement Type | Duplex |
| Style | Casual |
| Features | 12-Hour Dial |
| Case Material | Silver |
| Country Of Origin | United Kingdom |
| Display | Analogue |
In 1782, Thomas Tyrer obtained a patent for it in London. A slot in the roller on the lower part of the balance staff allows a pointed tooth of the escape wheel to pass and rotate to the next position, where it is locked.
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