Extremely heavy English silver chronometer watch Circa 1816

Silver pair cased chronometer 
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An extremely heavy and very fine English silver pair cased pocket chronometer made by James McCabe in London, circa 1816. Chronometer movement in the manner of Earnshaw with a spring detent escapement, Z balance with trapezoidal weights, helical hairspring, diamond endstone and screwed gold chatons. White enamel dial with Roman hour numerals, an outer minute track, subsidiary seconds at 6 o’clock and rose gold spade hands. Plain cases. Matching London hallmarks for 1816, matching maker’s mark JM, signed and numbered movement, signed and numbered dial.
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Diameter: 62.5 mm
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Weight: 197 g
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Signed: Jas McCabe Royal Exchange London
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James McCabe mainly made pocket watches. For them he used various different escapements. Finally, he specialized in duplex escapements. He separated his pocket watches and chronometers into three quality and price categories. To distinguish them he used different signatures:
1. James McCabe for the highest quality watches;
2. McCabe for the medium quality watches;
3. Beatson for watches of daily use.
McCabe was appointed to the Clockmakers’ Company on April 2nd, 1781 together with 37 others (including Emery, Frodsham, Pinchbeck and Vulliamy). From April 1787 he was a full member of the guild and became a Junior Warden in January 1809 and two years later a Senior Warden in July 1811.