English 18k gold watch with rack lever escapement Circa 1812

Gold pair cased lever watch by Anness
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A fine and very rare English 18 carat gold pair cased lever pocket watch with rack lever escapement, Hallmarked London 1812. Hinged, frosted gilt full plate movement, cylindrical pillars, jeweled to the third, fusee and chain, Harrison’s maintaining power, rack lever escapement with large brass escape wheel, three armed steel flat rim balance with flat balance spring, diamond endstone, single footed foliate engraved cock, regulator arm with engraved scale on the backplate. Gilt brass dust cap. White enamel dial with Arabic numerals, outer minute divisions and original gold pear hands. Plain outer case, mastermark WM for William Mean, plain inner case. Movement signed.
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Diameter: 52 mm
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Signed: Anness Cheapside Londen
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The rack lever escapement was patented by Litherland in 1791 and was used by both Liverpool and London makers during the first quarter of the 19th century. The present watch is rare due to the gold pair case, as most rack lever watches were made with silver cases.