Rose gold pair cased lever with stoppable seconds Circa 1807

Rose gold pair cased pocket watch with stoppable seconds by Litherland
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Extremely heavy, early English 18 carat rose gold pair cased pocket watch with stoppable seconds, Hallmarked 1807. Plain case. Rack lever movement, inscribed patent No. 4315, Liverpool windows with sapphire jewels, diamond end stone on the balance staff, unusual cock with bird scene, below the inscription Patent refering to the Litherland patent of 1791, small lever in the band to stop the seconds. White enamel dial with Roman numerals and rose gold hands.  especially in this version with a heavy original gold case. Movement signed. Matching master’s mark John Harris.
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Diameter: 56 mm
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Weight: 168 g
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Signed: Litherland Liverpool
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Peter Litherland was a British watchmaker and inventor. He was born in Warrington and moved later to Liverpool, the centre of the watch trade at that time. In 1791 he patented the rack lever escapements for watches, which were more precise than the usual lever escapements.
Original pocket watches with rack lever escapements signed by Litherland are very rare.