English silver pair cased watch with centre seconds Circa 1800

Silver cylinder pocket watch with centre seconds
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An English silver pair cased pocket watch with centre seconds, circa 1800 or later. Fire gilt full plate cylinder, pierced and engraved balance cock, diamond endstone, silver regulation, round baluster pillars.
White enamel dial, black 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, case hallmarked for 1851. Signed movement & inner cap, inner case stamped T.W
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Diameter: 49 mm
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Signed: Alexander Mitchelson, London