Swiss 18-carat gold open faced pendant watch Circa 1870

Pink gold watch with lever escapement by Breguet
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A Swiss, keyless-winding, pink gold pendant watch with open-face, circa 1870.
An 18-carat pink gold case with an engraved back in taille-douce (fine cut) with a cypher. An enamel dial with Roman radial hours, outer minutes track with Arabic five minutes numerals, a subsidiary dial for the seconds at 6, and blued spade hands. And a gilded brass movement with going barrel, straight-line equilibrated lever escapement, cut compensated balance, and blued steel flat hairspring.
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Diameter: 31 mm
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Signed: Breguet