French diamond-set fob watch in the shape of a padlock Circa 1880

Gold diamond-set fob watch by Gustave Sandoz
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An extraordinary diamond-set fob watch in the shape of a padlock, circa 1880.
Gold case, hinged bow, opaque black enamelled front cover with hinge, diamond-set keyhole motif to the centre, engraved monogram R on the back side, inside case back with glazed cover to insert a picture, signed and numbered heart-shaped gold dome. Enamel dial with radial Roman numerals and Breguet hands. Heart-shaped bridge movement, keywind, frosted, gilt, cylinder escapement, three-arm brass balance.
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Dimensions: 46 x 27 mm
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Weight: 36 g
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Signed: Gustave Sandoz, Paris
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This watch has an interesting opening mechanism – when the shackle is released, the front cover opens, and the time can be read.