English brass watch with spring detent chronometer Circa 1820

Important small one day marine chronometer
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An important one day chronometer, made by Thomas Earnshaw in London, England, circa 1820. The open faced case of this watch was crafted from brass, is glazed and mounted in a three part mahogany box with a gimbal suspension. The numbered white enamel dial features Roman hour numerals, a subsidiary seconds dial at 6 o’clock and blued steel hands. The movement features a spring detent chronometer escapement, a chronometer balance with two trapezoidal weights and two platinum screws, a helical hairspring and a diamond end stone.
The dial is signed.
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Diameter: 76 mm
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Dimensions:  16 x 16 x 16 cm
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Signed: Thomas Baker
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Baker
The dial is signed Thomas Baker, London. Thomas Baker was supplied by Thomas Earnshaw and did not produce any marine chronometers himself. The motion train has the typical Earnshaw ‘quick train’ toothing. It is therefore one of the rarest English chronometers. Only a few Earnshaw marine chronometers are still in existence today.