English silver pair cased key wound pocket watch Circa 1760

Silver verge in pair cases 
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An English pair cased key wound pocket watch, circa 1860. The movement with a verge escapement, circa 1760 White enamel dial with Roman hours, an outer minute track, outermost Arabic five minute numerals and poker & beetle hands. A smooth inner case, the outer case with tortoiseshell on the back. Dial and movement signed.
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Diameter inner case: 43 mm
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Weight: 42 g
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Diameter outer case: 52 mm
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Weight incl. outer case: 71 gr.
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Signed: Graham London
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The hour hand is loose.