Swiss/French 18k gold keyless calendar fob watch Circa 1870

Gold watch with detachable three-row chatelaine
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A fine and unusual Swiss/French 18k gold keyless calendar fob watch, circa 1870.
With enamelled initials LW on detachable yellow gold three-row chatelaine with pin and matching enamelled initials LW. The reverse with outer engraved decoration to central blue and black enamelled monogram LW within an oval cartouche, time and calendar adjusters to the band, hinged gold cuvette.
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White enamel dial, inner date ring, black Roman numerals, outer minutes with Arabic five-minute numerals. Gold spade hands, blued steel calendar indicator. A bar calibre, rhodium plated movement, Geneva striping decoration, wolf’s tooth winding wheels, cylinder escapement, gilt three-arm balance, flat hairspring, index regulator. Cuvette signed, case numbered.
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Diameter: 31  mm
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Signed: B. Haas Je & Cie  Genève, Besancon & Paris