English massive silver lever watch with stop slide Circa 1833

Rare and massive silver lever watch with stop slide
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An English rare and massive silver open-faced lever watch with stop slide, circa 1833, gilded full plate movement, Massey lever escapement with Type IIroller, decoratively engraved balance cock marked Detach’d, ruby endstone, mono-metallic balance with blued steel screws, fusee and chain with maintaining power, cylindrical pillars, signed John Cohan, Liverpool.
White enamel dial, Roman numerals, outer minute ring, subsidiary seconds with Arabic numerals, gold spade hands, signed John Cohan, Patent Lever Watch Manufacturer, Liverpool.
Massive plain silver case, the hinged back opening to reveal fixed cuvette with winding aperture, stop slide beneath bezel at 5 o’clock, plain ring pendant, inner and outer backs hallmarked Chester 1833, inner with maker’s mark RL in cameo for Richard Lucas.
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Diameter: 109 mm
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Signed: John Cohan Liverpool
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This extremely large and very heavy watch may well have been made as a coach watch, although it is also possible that it was intended as an exhibition piece. It appears that a marine chronometer ébauche has been used, this is perhaps unsurprising since Cohan is recorded as a chronometer maker at 15 Cannon Place, Liverpool, and the plates are both thick and weighty.