Swiss 18K pink gold open faced watch Circa 1911

Gold lever watch by Patek Philippe
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A pink gold open faced watch, retailed by Gondolo & Labouriau, circa 1911. Manual winding movement, lever escapement, white enamel dial, painted black radial Roman numerals, pink gold Spade hands, subsidiary seconds, outer minute track with Arabic divisions, 18k pink gold case, hinged inscribed cuvette and guilloché case back, case, dial, and movement signed.
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Diameter: 51 mm
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Signed: Patek Philippe Genève
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Accompanied by a Patek Philippe Extract from the Archives.