English gold watch with Earnshaw’s spring detent escapement Circa 1819

Gold chronometer pocket watch 
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A very fine and very rare English, 18K gold pocket watch with Earnshaw’s spring detent escapement and bimetallic balance, circa 1819. Pocket Chronometer made by James Mc Cabe, Royal Exchange, London. The case is made by Thomas Walker II, with London hallmarks for 1819-1820. A polished back with engraving AB, 1819, fixed gold cuvette. White enamel dial, radial Roman numerals, outer minute divisions, large subsidiary seconds. Gold spade hands.
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A gilt, full-plate movement, cylindrical pillars, fusee and chain, maintaining power, Earnshaw’s spring detent escapement, escape and first wheels jewelled with end stones in screwed chatons, inverted under-sprung Earnshaw-type bimetallic cut compensation balance with four brass timing screws, diamond endstone, chased and engraved single footed cock, free-sprung flat balance spring. Dial and movement signed and numbered.
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Diameter: 55 mm
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Signed: James Mc Cabe  London