Swiss 18 carat gold open faced lever chronograph Circa 1900

Gold manual wind pocket watch
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A Swiss 18 carat yellow gold open faced manual wound pocket watch with chronograph, circa 1900. It has a mechanical movement with lever escapement. The white enamel dial features black  Breguet numerals for the hours, an outer minute track with red Arabic five minute numerals and fifth of a second divisions, subsidiary seconds at 6 o’clock, a central chronograph hand,  30 minute counter at 12 and black spade hands. A plain case.
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Diameter: 50 mm
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Weight: 92.5 g
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Signed: No name
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The dome is damaged.