Rare English 18k gold precision pocket watch Circa 1817

Rare gold open faced pocket watch
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A rare, early English precision pocket watch made by John Roger Arnold, circa 1817.
18-Carat gold, tiered, polished case with case maker’s punch mark TH (Thomas Hardy). Signed enamel dial with radial Roman numerals, auxiliary seconds,  numbered 3783, and gold spade hands. Full plate movement, keywind, fire gilt, signed, chain/fusee, stone cylinder escapement, three-arm steel balance, and engraved regulator scale and long blued index hand with fixed bimetallic temperature compensation slat.
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Diameter: 51 mm
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Weight: 129 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.