English silver lever with thirty tooth escape wheel Circa 1853

Silver fusee lever pocket watch 
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An English silver open-faced fusee lever pocket watch with thirty tooth escape wheel, Hallmarked London circa 1853. Full plate gilt keywind fusee movement with gilt dust cover, Harrison’s maintaining power, plain cock, plain three-arm steel balance with blue steel spiral hairspring, blue steel Bosley regulator, English table roller lever escapement with thirty tooth escape wheel. White enamel dial with Roman numerals, subsidiary seconds rotating one revolution every fifteen seconds, and blue steel hands. Engine turned case. Maker’s mark GH.
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Diameter: 50 mm
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Signed: No name
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It is unusual for watches to have 30 tooth escape wheels. The seconds hand is mounted on the escape wheel arbor and so rotates once every 15 seconds. However it would seem that a special dial was not ordered for the watch, the seconds still being marked up to sixty.