English silver watch pivoted detent escapement Circa 1845

Silver chronometer pocket watch
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An extravagant, very heavy pocket watch chronometer by Robert Roskell Liverpool, hallmarks, circa 1845. A smooth silver case, hallmarks 1845, case maker’s punch IBWW, spring detent escapement with spring in manner of Earnshaw, two part bi metallic compensation balance in the manner of Earnshaw with two wedge shaped, rounded sliding brass weights and two large steel regulating screws, steel shafts with eyelets in the manner of Earnshaw to stabilize the balance to the mass weights, finely engraved balance bridge with blued steel chaton and diamond end stone, escape wheel with screwed gold chaton, special blued helical hairspring; main plate signed and numbered, original, signed enamel dial; blued steel hands, very beautiful condition, in working order, imposing chronometer.
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Diameter: 62 mm
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Weight: 216 g
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Signed: Robert Roskell Liverpool
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The Liverpool born Robert Roskell (ca.1805-1873) was one of the best known English chronometer makers. He made marine deck watches and very fine pocket watch chronometers. There is a.o. also a Roskell signed pocket watch chronometer based on Earnshaws Sugar Tong type.