English silver open faced spring detent chronometer Circa 1899

Fine quality spring detent chronometer
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A fine spring detent chronometer, made by William John Watkins in London, England, circa 1899. The numbered open faced case was crafted from silver, has the London Hallmarks from 1899 and a monogram on the back lid. The white enamel dial has Roman hour numerals, a subsidiary seconds dial at 6 o’clock and blued steel hands. The numbered movement has a very fine chronometer escapement with large chronometer balance, a helical hairspring, a diamond end stone and a finely engraved cock.
Case and movement have matching numbers and the movement is signed.
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Diameter: 51 mm
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Weight: 106 g
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Signed: William John Watkins, London