Swiss 18K gold repeating digital lever dress watch Circa 1973

Gold watch with American perpetual calendar
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An extremely fine, very rare and elegant Swiss 18 carat yellow gold open faced minute repeating keyless lever dress watch with an American perpetual calendar and moon phases, circa 1973. Accompanied by an Extract from the Archives. The movement was made in 1947, completed and cased in 1973 and sold on December 1st, 1980. A polished and brushed case with a stepped bezel.
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Brushed silver dial with applied yellow gold baton indexes, outer minute divisions, an aperture for the days of the week, the months and the date, subsidiary seconds with concentric moon phases and yellow gold dauphine hands. A rhodium plated movement with Geneva striping decoration, 29 jewels, wolf’s tooth winding, a counterpoised straight line lever escapement, monometallic balance adjusted to heat, cold, isochronism and five positions and self compensating Breguet balance spring with a swan neck micrometre regulator, repeating on gongs activated by a slide in the band. Dial, case and movement signed.
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Diameter: 51 mm
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Signed: Patek Philippe Genève
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The linear digital calendar or so-called American (perpetual) calendar is a calendar in which the date is displayed in a single linear aperture, allowing for a legible dial to be read at a glance. This type of display was invented in the early Art Deco period and is most often found in watches destined for the Anglo-American market. This kind of calendar became popular once again after the Second World War.