Rare French silver open faced verge pocket watch Circa 1785

Silver open faced verge by Louis Bichon 
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A fine and rare French silver open faced verge pocket watch, circa 1785. Matte gilt movement, baluster pillars, fusee and chain, verge escapement, three armed balance, flat balance spring, pierced and foliate chased silver continental type balance cock with polished steel end piece and faceted endstone, large silver regulation dial with radial Roman numerals. White enamel dial with Roman numerals, inner half hour markers, outer minute track and Arabic five minute numerals and replaced gold Louis XVI hands. Plain case. Movement signed.
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Diameter: 45 mm
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Signed: Bichon à Moulin
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Louis Bichon, a watchmaker and merchant in Moulins, 1785-1806.