English chronometer with 56 hour power reserve Circa 1860

Mahogany cased chronometer by Charles Frodsham
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A very fine English mahogany cased ship’s chronometer with 56 hour power reserve indicator, circa 1860.
Mahogany box, brass inlays, bone signature shield, screwed on handles, with lid, glass and case key. Silvered signed and numbered dial with inlaid radial Roman numerals, auxiliary seconds, power reserve indicator and gold spade hands. Brass movement, polished, decorated and signed, with moulded pillars, chain/fusee, spring detent escapement, heavy chronometer balance with two weights and two screws, freesprung blued helical balance spring and chatoned diamond endstone on balance.
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Dimension box: 175 x 190 x 175 mm
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Signed: Charles Frodsham, 84 Strand London
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Charles Frodsham (1810-1871)
Charles Frodsham was a maker of very fine watches, originally of the Strand, London, and then New Bond Street. His best quality watches bear the letters AD.Fmsz, which is interpreted as 1850, the year he bought J.R. Arnold’s estate after his death; the firm was known for a short period as Arnold and Frodsham. He conducted many experiments with compensated balances and the balance spring to discover their underlying principles; he also wrote several papers on technical subjects.