English heavy silver imposing pocket chronometer Circa 1845

Open faced pocket watch by Robert Roskell
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An extravagant, very heavy English pocket watch chronometer with hallmarks 1845.
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 manner of Earnshaw with two wedge shaped, rounded sliding brass weights and two large steel regulating screws and in manner of Earnshaw steel shafts with eyelets 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. Signed enamel dial, Roman hours, subsidiary dial with Arabic seconds, blued steel hands.
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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 produced marine deck watches and very fine pocket watch chronometers. There are i.a. also a Roskell signed pocket chronometer with Earnshaws Sugar-Tong-type.