Belgian gold quarter repeating à toc verge watch Circa 1790

Gold open-faced repeater à toc with calendar by Hubert Sarton
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A fine and rare Belgian 18-carat gold open-faced quarter repeating à toc verge pocket watch with calendar, circa 1790. Hinged gilt brass full plate movement with cylindrical pillars, fusee with chain, polished steel chain guard, verge escapement, plain brass three armed balance, flat balance spring, gilt brass continental cock with polished steel endplate, silver regulation dial. White enamel dial with Roman numerals, outer minute divisions and Arabic five-minute numerals, inner date ring with corresponding hand, original gold beetle and poker hour and minute hands, pierced steel calendar hand. Polished Lépine case with concealed hinge, gilt brass dust ring. Dial and movement signed.
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Diameter: 60 mm
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Signed: Sarton à Liège
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Hubert Sarton was born in Paris in 1748. Around 1772 he became a pupil of J. Le Roy. Sarton settled in Liège, where he died in 1828 at the age of 80. In 1782, he published a “Description de plusieurs pièces d’horlogerie”. He made clocks with carillon, regulator escapements with compensation, clocks with decimal indications, self-winding watches, etc.