Fine Swiss 18 carat gold open faced lever watch Circa 1980

Gold open faced lever watch
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A fine Swiss, open faced, keyless, 18K gold watch, circa 1980. 18-Jewels movement, Swiss lever, Geneva striping, compensated balance, swan neck regulation, double Seal of Geneva, adjusted to heat, cold, isochronism & 5 positions.
White enamel dial, black Roman numerals, black outer minute divisions with 5-minute markers, subsidiary seconds at 6, polished pointed baton hands. Brushed and polished round case, snap-on back. Case, dial & movement signed.
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Diameter: 47 mm
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Signed: Patek Philippe  Genève
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Including Patek Philippe box, 18K gold chain, Patek Philippe service receipt dated 29/03/17.