English pair cased verge watch with center seconds Circa 1781

Open faced pocket watch by Joseph Denton Hull
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A technically interesting, early English pair cased verge pocket watch with center seconds and hallmarks, circa 1781.
Original silver case with identical hallmarks from 1781 and identical casemaker’s punch JC; technical interesting and very rare English verge movement with center seconds, a splendid bridge and a signed and numbered main plate; original and signed white enamel dial with decentralized time Roman indication, center seconds and steel hands (two hands not original and center seconds stop lever missing)
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Diameter: 54 mm
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Weight: 128 g
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Signed: Joseph Denton Hull