Fine Swiss pink gold open faced chronograph watch Circa 1901

Pink gold open faced chronograph watch by Patek Philippe
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A fine Swiss pink gold open faced chronograph watch, circa 1901.
Nickel silver movement, cut bimetallic balance with peripheral timing screws and blued Breguet balance spring with terminal curve, François Wilmot’s micrometric cam regulation system • white enamel dial, painted Roman numerals, pink gold pear hands, subsidiary seconds, outer minute and 1/5 seconds divisions, 18k pink gold bassine case, chronograph pusher to the band, security slide for the chronograph at 1, cuvette engraved Eugène Deforgeand the monogram D.M engraved on the back, case, cuvette, dial and movement signed.
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Diameter: 50 mm
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Signed: Patek, Philippe & Cie Genève
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With an Extract from the Archives confirming sale in 1903.