English cylinder by Brockbanks in silver pair cases Circa 1813

Silver pair cased cylinder pocket watch by Brockbanks
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An English cylinder by Brockbanks in silver pair cases, hallmarked London circa 1813. Full plate fusee movement. Gilt dust cover pierced to reveal the table of the cock engraved with an anker and flags, diamond end stone in a blue steel setting. Gilt regulator on top plate below the plain three arm steel balance. Polished steel cylinder, large brass escape wheel. Signed white enamel dial with subsidiary seconds, Roman numerals, blue steel seconds hand and gold hands. Silver pair cases, inner with silver oval pendant and bow, maker’s mark ‘JN’ in an oval and number corresponding to that on the movement. Well fitted in a silver outer case hallmarked Birmingham 1819.
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Diameter: 57 mm
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Depth: 12 mm
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Signed: Brockbanks London
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In excellent condition.