Swiss gold brooch watch set with 17 round diamonds Circa 1890

Gold, diamond brooch watch by Tiffany & Co. 
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A very fine Swiss, 18 carat gold and diamond set lady’s keyless pendant watch, circa 1890. With an 18 carat gold and diamond set Tiffany & Co. detachable bow brooch. The back cover is set with 17 round white diamonds. Hinged gold cuvette with an applied photographic print of a military gentleman. White enamel dial, radial Arabic numerals, outer minute track, outer red Arabic five minute numerals. Gold Louis hands. A rhodium plated movement, Geneva striping decoration, 17 jewels, straight line lever escapement, cut bimetallic compensation balance, blued steel flat balance spring, index regulator. Dial, case and movement signed.
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Diameter: 27 mm
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Signed: Tiffany & Co.  Swiss