French 20k gold open faced verge pocket watch Circa 1760

Gold verge watch by Porte Fils
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A fine French 20 carat gold open faced verge pocket watch, circa 1760. Frosted gilt movement, pentagonal baluster pillars, fusee and chain, verge escapement with micrometric potence adjustment, three armed steel balance, pierced and engraved continental balance cock, silver regulation dial. White enamel dial with Roman numerals, outer minute track and Arabic five minute numerals, gold Louis XV hands. Louis XV, engraved. Dial and movement signed.
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Diameter: 44 mm
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Signed: Porte Fils à Rouen