Swiss perpetual calendar watch with moon phases Circa 1949

Fine gold keyless perpetual calendar watch with moon phases
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A fine Swiss rare yellow gold open faced keyless perpetual calendar watch with moon phases, circa 1949, manual winding nickel lever movement, swan neck precision regulator, 18 jewels, cut bimetallic compensation balance.
Silvered dial, applied yellow gold Arabic and dot indexes, four subsidiary dials for month combined with leap year, day, date and moon-phases combined with constant seconds.
18k Yellow gold circular case, concave bezel, snap-on back, case, dial and movement signed.
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Diameter: 46 mm
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Signed: Patek Philippe Geneve
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With an Extract from the Archives confirming sale in 1950.Production of reference 725 began in 1940 and ceased in the late 1960s. It is interesting to note the similarities between the styling of the reference 725 pocket watch and its contemporary wristwatch models. The first series reference 725, to which the present lot belongs, had applied Arabic and dot numerals, similar to those of the famous perpetual calendar reference 1526 wristwatch. The second series of Ref. 725 featured applied baton numerals, a change that was also seen in the last examples of the reference 2497 and the 2438-1 models. Both the first and second series of reference 725 had scooped bezels, another design feature in common with the major complication Patek Philippe wristwatches of the same era.