George IV silver open face large pocket watch by John Forrest,…
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George IV silver open face large pocket watch by John Forrest, London, key wind fusee movement, numbered 2206, conforming numbered case, hallmarked Chester 1828. Silver dial with raised Roman numerals on lineal machine engraved chapter ring, engraved floral centre, subsidiary seconds dial at VI. Diameter 5.7 cm

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  • Movement - The technical name for the workings of a clock or watch, and does not include the dial or case.
  • Chapter Ring - A separate metal plate on the face of a clock, on which the numerals for the hours and sometimes parts of the hours, are displayed, usually wheel shaped and sitting on top of the dial plate. The chapter ring is often a feature of the clock and can be silvered or enamelled to stand as a contrast to its background. The hours are usually shown in Roman numerals, although in the late 19th and earlt 20th century, Arabic numerals became fashionable.
  • George Iv - George IV (1762 ? 1830) was king of the United Kingdom of Great Britain and Ireland and king of Hanover from 1820, until his own death in 1830. From 1811 until his accession in 1820, he served as Prince Regent during his father's final mental illness.

    In English furniture design, his reign from 1811 to 1830 is known as the Regency period.
  • Fusee - The fusee movement was used in clocks and pocket watches from the mid 17th century. The fusee is a cone shaped drum within the works that is linked to the barrel of the spring, usually by a length of chain.

    As the mainspring loses its tension over time, the cone shaped barrel compensates for this by increasing the tension, by pulling the mainspring tighter, thus ensuring the time remains constant.

    Use of the fusee in clocks was superseded by the "going barrel" in the mid 19th century and for pocket watches at the beginning of the 19th century.

    The fusee continued to be used in marine chronometers until the 1970s.

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