American platinum sapphire and diamonds brooch watch Circa 1925

Platinum Art Deco lady’s brooch watch
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A very fine and rare American, elegant and lavishly decorated sapphire and diamond-set platinum Art Deco pendant watch with a matching brooch, circa 1925. An oval case, the back centred with a diamond- and sapphire-set rosette, small diamond-set pendant with an additional ogival link set with diamonds and sapphires. Matching oval brooch. Silver dial with champlevé radial Arabic numerals, outer minute track, engine-turned centre. Blued steel Breguet hands. Extra Precision, nickel movement, Geneva striping decoration, 18 jewels, stamped with the Seal of Geneva Quality Mark, all adjustments, straight-line lever escapement, cut bimetallic compensation balance with Breguet balance spring, platinum dust cap. Dial and movement signed.
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Total length: 75 mm
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Dimensions: 33 x 18 mm
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Signed: Gruen Watch Co.
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At the time this watch was made, Gruen was in partnership with Rolex. The company’s official name was Société Anonyme Fabrique des Montres Rolex & Gruen Guild. Gruen watches of the period were of the same quality as Rolex, and sometimes even better.