Interesting English pocket watch with lever escapement Circa 1843

Open faced watch with English Hallmarks  
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An interesting pocket watch made by John Frodsham & Son in London, England, circa 1843. The open faced case of this watch is engine turned on the back and has English Hallmarks from 1843 and the white enamel dial has black Roman hour numerals, a subsidiary seconds dial with black Arabic numerals at six o’clock and blued steel hands. The numbered movement has a lever escapement, a diamond end stone and a chain fusée.
Dial and movement are signed.
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Diameter: 50 mm
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Weight: 104 g
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Signed: Frodsham Grace Church Street, London                
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John Frodsham & Son
John Frodsham operated a separate branch of the Frodsham pocket watchmaking dynasty as John Frodsham & Son.  He took his nephew George Edward into the firm and after the death of the son/brother figures in the late 1840’s, George Edward took over, transitioning the company through names like Frodsham Son & Co. and Frodsham & Baker before operating as George E. Frodsham until 1901.