English tourbillon with pivoted detent escapement Circa 1875

Gold hunting cased chronometer by Henry Delolme
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A heavy English hunting cased pocket watch with one minute tourbillon Chronometer, circa 1875.
18 Carat gold, tiered, polished, à goutte case with a gold dome with engraving. Enamel dial with radial Roman hours, auxiliary seconds, and paste-set hands. Signed, keywind, nickel-plated, decorated bridge movement with finely executed mirror-polished steel tourbillon cage, screwed gold chatons, pivoted detent escapement, gold screw compensation balance, pink gold train, free-sprung blued balance spring, and chain/fusee with Harrisons maintaining power.
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Diameter: 55 mm
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Weight: 158 g
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Signed: Henry Delolme London
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Henry Delolme, located at 48 Rathbone Place, Oxford Street, London, was active in the mid 19th century as a manufacturer, importer and designer of watches and chronometers. He was born at Brunswick in 1799, the youngest son of watchmaker Antoine Niclas Delolme. He was working in London by 1827. On the 9th January 1829, he married Jane Amelia Labarthe in the Old Church, Saint Pancras, London. At the 1851 Great Exhibition, he presented seven gold watches and two marine chronometers, with isochronous pendulum springs, a specimen of the movements, as made in Lancashire to the exhibitor’s calibre, two specimens of watch movements, to the exhibitor’s calibre. He furthermore exhibited a ‘Stethometer, to measure the comparative mobility of the chest in cases of disease of the lungs’. He died in 1890.