Fine English 18K gold pair cased verge watch Circa 1780

Gold verge watch
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A fine English 18 carat gold pair cased polished key wind pocket watch, circa 1780. Fire gilded full plate movement with verge escapement, chain/fusee, three armed steel balance, finely florally engraved and pierced balance cock.
White enamel dial with black Roman numerals and black outer minute divisions, gilt arrow hands.
Polished inner and outer cases. Signed movement, case stamped RP.
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Diameter: 49 mm
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Signed: Jos’ h Martineau, London
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Probably Joseph Martineau (I). London (Orange Street and later St. Martin’s Court) 1744-1794