Unusual Swiss gunmetal and gold pendant watch Circa 1911

Gunmetal ladies’ watch 
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A fine and unusual Swiss gunmetal and gold open faced keyless ladies’ pendant watch made by Patek Philippe in Geneva, circa 1911. Sold on June 24th, 1912. The frosted gilt movement with 15 jewels, wolf’s tooth winding, a straight line lever escapement, cut bimetallic compensation balance with flat balance spring and an index regulator. White enamel dial with black Arabic hours, an outer minute track, outermost red Arabic five minute numerals, an inner red 24 hour chapter ring, subsidiary seconds at 6 o’clock and gold Louis XV hands. A case back with the engraved monogram MR on the back, and gold bezel, hinge, bow and thumb piece. A further hinged gunmetal cuvette. Dial, cuvette and movement signed, case and movement numbered. Accompanied by an Extract from the Archives.
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Diameter: 32 mm
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Signed: Patek, Philippe & Cie Genève
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The Extract from the Archives confirms the oxydized matte black case and monogram MR, enamel dial and small seconds hand. Curiously, the remark states ‘the sweep center seconds hand mechanism was added in our premises in July 1934’. However, there is no indication that this watch was ever fitted with a center seconds hand mechanism.