English brass marine deck chronometer 8 day chronometer Circa 1820

Chronometer in three part mahogany box
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A numbered marine deck chronometer with extremely rare eight day chronometer made by Parkinson & Frodsham in London, England, circa 1820. The open faced glazed case was crafted from brass and was mounted in the numbered three part mahogany box with gimbal suspension. The silvered dial is numbered, has Arabic five minute and Roman hour numerals, an eight day power reserve indicator at twelve o’clock, a subsidiary seconds dial at six o’clock and gold and black hands. The beautiful early eight day movement has a chronometer escapement, a diamond end stone, a chronometer balance with two trapezoidal weights and four weight screws and a helical hairspring.
Dial and movement signed.
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Dimensions: 185 x 185 x 185  mm
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Signed: Parkinson & Frodsham, 4 Change Alley London
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Parkinson & Frodsham
Parkinson & Frodsham. William Parkinson (died circa 1842), free of the Clockmakers’ Company in 1802, had entered into partnership with William James Frodsham (1779-1850) in 1801. Parkinson & Frodsham, at 4 Change Alley, specialised in pocket and marine chronometers. Between 1835 and 1869 at least 139 chronometers were sent to the U. S. Probably in 1847 Frodsham left the business to his sons George and William (William Parkinson had died in 1844). Around 1860 George sold his share of the business to William. Upon George’s death in 1873, his son George William succeeded him. He showed watches and chronometers at international and national exhibitions and diversified the firm’s production. In 1912, after Frodsham’s death, his widow sold the firm to its foreman, William Shrubshall Harris. The firm continued until 1947, though its premises were destroyed by bombing in July 1944.