Swiss diamond-set gold and platinum pendant watch Circa 1910

Gold, platinum and diamond-set pendant watch with necklace 
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A magnificent, ultra-thin Swiss 18 carat gold, platinum and diamond-set lady’s pendant watch with a corresponding necklace, circa 1910.
The case back is ornamented with translucent blue enamel over an engine-turned ground, a pierced and diamond-set platinum rosette in the centre, the rim and crown are both set with diamonds and a translucent blue enamelled engine-turned bezel. The corresponding necklace with engine-turned and translucent blue enamelled lancet-shaped links decorated with white flower heads.
Signed, gilt engine-turned dial with Arabic numerals, outer minute track and blued éventail hands. Signed, rhodium-plated bridge movement with Geneva Striping decoration and a screw compensation balance.
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Diameter: 31 mm
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Weight: 27 g
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Signed: Touchon & Co à Genève
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Touchon & Co. A watch manufacturer founded in 1901 that was first established in Sécheron, later in Petit-Saconnex (districts of Geneva) and subsequently at 1, Place de la Fusterie. The trademark was registered on February 2, 1907, under No. 21652. The manufacturer, which produced high-quality watches, merged with Agassiz Watch Co. S.A., to launch extra slim watches on the market of 16 1/2″‘- 17/12th, 15/12th, 10/12th and even 10″‘- 10/12th. This latter movement, fitted in its case, could be concealed into a 20-dollar coin and was awarded the Gold Medal at the Paris Exhibition in 1889 and, in 1910, received the highest distinction in Brussels. The company produced these watches for Tiffany. In 1921, Touchon entered into a partnership with Wittnauer, under the new company name of Wittnauer & Cie, for the production of watches and spare parts, and moved premises to 4, Rue du Mont-Blanc until 1924.