English silver open faced cased deck-chronometer Circa 1856

Silver chronometer by Parkinson & Frodsham
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An English deck-chronometer with original exotic wooden box with signed and numbered bone shield, circa 1856.
This watch from London consists, a silver case with case maker’s punch mark “IT”, a white enamel dial with Roman numerals for the hours and Arabic for the minutes and subsidiary seconds.
It has a full plate movement, a chain/fusee, a spring detent escapement according to Thomas Earnshaw, a bimetallic chronometer balance with 4 screws and 2 weights and a freesprung helical balance spring.
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Diameter: 58 mm
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Weight: 193 g
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Signed: Parkinson & Frodsham, London
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In 1801 William James Frodsham, son of William Frodsham the Younger, and William Parkinson founded the company that was to become famous as Parkinson & Frodsham at 4 Change Alley, Cornhill in London. The two partners decided to specialize in pocket and marine chronometers; the location of their business was perfect for that because the coffee houses in the vicinity such as Garroway’s were frequented by captains, merchants and sales representatives of foreign trading houses who came to make their transactions. Very soon the company did not only supply the British Admiralty with their goods but exported them to the whole of Northern Europe. Several expeditions were equipped with their watches.