English engine turned gold watch in original box Circa 1820

Gold open faced lever watch
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A rare pocket watch with Massey-Typ-II-lever escapement according to Edward Massey with an original box, circa 1820.
An 18k gold engine-turned case, reeded band, ase maker punch mark “EJ”,enamel dial, radial Roman hours, auxiliary seconds, signed, gold spade hands, full plate movement, keywind, frosted, gilt, chain/fusee, large chatoned jewels “Liverpool windows”, moulded pillars, Massey-Typ-II-lever escapement, three-arm brass and steel ring balance, fine florally engraved balance cock, signed “Patent”, engraved regulator scale, chatoned diamond endstone on balance.
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Diameter: 52 mm
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Weight: 129 g
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Signed:  Robert Roskell  Liverpool