English silver open faced chronometer pocket watch Circa 1783

A museum standard piece by John Arnold
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Extremely rare English pocket chronometer by John Arnold no.36 / 337, circa 1783.
Completely original condition, silver London hallmarks of 1783, case maker punch WW, Arnold chronometer movement with OZ- balance, solid gold hairspring with a double terminal curve, diamond endstone, pierced cage, completely signed and numbered plate.
Original enamel dial, Roman numerals, blued steel hands, excellent condition, museum standard piece.
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Diameter: 54 mm
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Weight: 134 g
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Signed:  John Arnold  London
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The watch is listed in Hans Staeger “100 years of precision watches from John Arnold to Arnold & Frodsham 1763-1862” Page 69.
It is one of the earliest still completely original Arnold Chronometer.