English gold watch with spring detent escapement Circa 1810

Gold gentleman’s pocket watch by John Roger Arnold
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A very fine gold English gentleman’s pocket watch with spring detent chronometer escapement, according to John Arnold and Arnold’s Z balance, circa 1810.
Full plate fire gilt Arnold spring detent, cut and compensated bimetallic oversized Z balance, chain/fusee, freesprung helical balance spring, diamond endstone. Signed white enamel dial with black Roman numerals, black outer minute track, subsidiary seconds at 6, and gilt spade hands. Polished 18-carat gold case with case maker’s punch mark WW.
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Diameter: 53 mm
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Weight: 149 g
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Signed: John Roger Arnold, London
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John Roger Arnold (1769-1843)
John Roger Arnold was the son of renowned British horologist John Arnold. He began his apprenticeship with A.-L. Breguet in Paris in 1792. The younger Arnold became a member of the Clockmaker’s Company in 1796 and was a Master in 1817. He took up a partnership with E.J. Dent in 1830 and the two craftsmen experimented heavily during their work together; in particular, they concentrated on the effects of magnetism on chronometers. Dent left Arnold in 1840, whereupon Arnold continued working on his own but died only three years later. Charles Frodsham bought the business after Arnold’s death in February 1843, and it flourished until 1858 under the name Arnold and Frodsham.