Art Deco Gruen Watch Co. , No. 9220, circa 1925. Very fine and rare lavishly decorated platinum, sapphire and diamond-set PRECISION EXTRA Art Deco pendant watch with matching brooch. Two-body, oval, the back centered with a diamond- and sapphire-set rosette, small diamond-set pendant with additional ogival link set with diamonds and sapphires. Matching oval brooch. Silver with champlevé radial Arabic numerals, outer minute track, engine-turned center. Blued steel Breguet hands. 20.5 x 14 mm., nickel, fausses côtes decoration, 18 jewels, all adjustments, straight line lever escapement, cut bimetallic compensation balance with Breguet balance spring, punched with Seal of Geneva Quality Mark, platinum dust-cap. Signed on dial and movement. Dim. 33 x 18 mm, length with brooch 75 mm. Notes At the time this watch was made, Gruen was in partnership with Rolex. The companys official name was Société Anonyme Fabrique des Montres Rolex & Gruen Guild. Gruen watches of the period were of the same quality as Rolex, sometimes even better. The lavishness of its case and the superior quality of its movement suggest that the present watch was destined for a horological exhibition.