Rare English 18K rose gold open faced pocket watch Circa 1812

Rose gold lever watch by Robert Roskell
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A rare English 18 carat rose gold open faced lever pocket watch, circa 1812. Full plate movement, key wind, a rack lever escapement according to Peter Litherland and three-arm steel balance. A movement protection cap. White enamel dial with Roman hours, an outer minute track, subsidiary seconds at 6 o’clock and spade & whip hands. The plain case with maker’s mark TH for Thomas Helsby, Liverpool. Dial, case and movement numbered, case and movement with matching numbers.
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Diameter: 49 mm
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Weight: 119 g
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Signed: R. Roskell Liverpool
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This piece is a pocket watch with a rare, experimental rack lever escapement made by the important Liverpool watchmaker Robert Roskell.
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Robert Roskell was a qualified English watch and clockmaker in Liverpool and London. Due to his various partnerships and takeovers, he signed in turn with Robert & Son, Hunt & Roskell, Robert Roskell Liverpool or Roskell Liverpool.