English silver pair cased watch with centre seconds Circa 1800

Silver pair cased cylinder pocket watch
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An English silver key wind pair cased pocket watch with centre seconds, circa 1800. Gilt full plate movement with cylinder escapement, pierced and engraved balance cock, diamond end stone, silver regulation, round baluster pillars.
White enamel dial with Roman numerals, black outer 1/5th second divisions with 5-minute Arabic numerals, gilt beetle and poker hands, centre seconds.
Polished inner and outer case, signed inner cap. Movement & inner cap signed, inner case stamped T.W.
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Diameter: 49 mm
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Signed: Alexander Mitchelson, London
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Early cylinder escapement and early centre seconds.