Swiss gold custom made case with glazed back Circa 1915

Gold watch with moon phases, perpetual and lunar calendar
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A very fine and rare Swiss, keyless pocket watch with perpetual calendar, moon phases and lunar calendar in a custom made 18 Carat yellow case, circa 1915. A polished case, screwed down bezel, transparent back, setting pins in the band. White enamel dial with radial Arabic numerals, outer minute track, subsidiary dials for the days of the week, the months, the date in red concentric with seconds, aperture for the moon phases with a lunar calendar at the edge. Blued steel spade hands. A rhodium-plated movement, Geneva striping decoration, 20 jewels, counterpoised straight-line lever escapement, cut bimetallic compensation balance with gold temperature and meantime adjustment screws, eight adjustments, blued steel Breguet balance spring, swan-neck micrometre regulator. Dial and movement signed. Property of an English Gentleman.
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Diameter: 53 mm
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Signed: Patek Philippe & Co  Genève
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The case of this watch was probably replaced relatively early in its life, possibly as a result of the original having been damaged. Many watches of this type were sold in America and it is probable that the original owner thought it too difficult or costly to return the watch to Switzerland for a new case. The screw down bezels of the present case also attest to their American origin.