Patek Philippe. An exceptional 18K gold perpetual calendar chronograph wristwatch with moon ...

Preserved in generally excellent original overall condition, the case has never been subject to careless polishing, underlined by the full proportions, the crisp "S.&L 18K" stamps to the case back and the well-defined fluting to the lugs It is believed that this was a method used at the time in the workshops of Patek Philippe to facilitate assembly of the correct case with the correct case back and bezel during the encasing of the movement, just before the final quality test.

The cases of the very first references 2499 were supplied by Vichet, featuring a smaller diameter of 36.2 mm Introduced to the market in 1950 it replaced the legendary reference 1518, the world's first perpetual calendar wristwatch with moon phase and chronograph made in series Over a period of 35 years, reference 2499 was made in four series in a total production of only 349 pieces, the majority cased in yellow gold.

First series, the present watch: square chronograph buttons, applied Arabic numerals and tachymeter scale- second series: round chronograph buttons, either applied baton or applied Arabic numerals and tachymeter scale - third series: round chronograph buttons, applied baton numerals and outer seconds divisions - fourth series: round chronograph buttons, applied baton numerals, outer seconds divisions and sapphire crystal Serpico y LainoSerpico y Laino was founded in the late 1920s by two Italian immigrants, Leopoldo Serpico and Vicente Laino, a young goldsmith. . Source