Swiss reversible cabriolet watch for the English market Circa 1850

Gold hunting cased lever cabriolet watch 
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A fine and rare Swiss 18 carat gold reversible hunting-cased cabriolet pocket watch made for the English market, circa 1850. Retailed by French, Royal Exchange, London. Matte gilt dial, bar calibre, 22 jewels, lateral lever escapement with tail, cut bimetallic compensation balance, blued steel flat balance spring, index regulator. White enamel dial with Roman numerals, outer minute track, subsidiary seconds and original blued steel spade hands. Detachable outer case, entirely engraved with foliage, the cover with engine-turned interior, the inner case with engraved pendant, bezel and bow, polished band, the back entirely engraved with foliage to match the outer case. Gold hinged cuvette. Cuvette signed by the retailer.
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Diameter: 51 mm
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Signed: French Royal Exchange London
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The cabriolet watch was probably conceived for customers who enjoyed field sports. The purpose of the reversible case is to protect the glass and dial from impact during vigorous activity. This idea was developed further by Jaeger LeCoultre in the 20th Century in the design of the iconic ‘Reverso’ wristwatch.