Early English 18K gold open faced lever watch Circa 1842

Gold lever with Massey type II escapement by Robert Roskell
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Early English 18 carat gold open faced lever pocket watch, circa 1842. Very fine English movement, large bimetallic balance, diamond endstone, bridge inscribed Patent, rare lever movement with Massey type II escapement, jewels/bearings so-called Liverpool Windows. Decorative gold champlevé dial with Roman numerals, subsidiary seconds, the rim decorated with three different gold colours. Plain case, reeded mid-section, stop-seconds device. Movement signed and numbered.
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Diameter: 50 mm
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Weight: 109 g
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Signed: Robert Roskell Liverpool