English chronometer with spring detent escapement Circa 1819

High-quality silver pocket chronometer by Robert Gibson
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A high-quality English pocket chronometer with spring detent escapement according to Thomas Earnshaw, circa 1819.
Silver, consular, polished case with case maker’s punch mark ATO (Albert Thomas Oliver). Enamel regulator dial with radial Roman numerals on an eccentric chapter ring, auxiliary seconds, and gold spade hands. Full plate movement, keywind, frosted, gilt, and signed; with chain/fusee, solid round movement pillars, three-arm bimetallic chronometer balance with three screws and three trapezoid weights, free-sprung blued helical balance spring, balance bridge, and large chatoned diamond endstone on balance.
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Diameter: 56 mm
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Weight: 182 g
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Signed: Robert Gibson, London
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Robert Gibson may be a brother of John Gibson of London, Sweetings Alley, who was famous for his chronometer and duplex movements. The outstanding craftsmanship and the still excellent timekeeping accuracy of movement no. 16 definitely suggest an exceptionally gifted maker. Presumably, the owner of the timekeeper at the time was aware of this when he ordered a new case for the movement from Albert Thomas Oliver around 1937; the company was still at 31 Wynyatt Street then. A.T. Oliver was a descendant of Richard Oliver who founded the company in the mid 19th century at 19 Galway Street, St Lukes.