In this model, reference 5235/50R, Patek Philippe combines the patented annual calendar, one of the company’s most popular complications, with a regulator display. The 40.5 x 10.0 millimeter case made of 18k rose gold stands out for its exquisite graphite-gray and black dial with a vertical brushed grain. The subsidiary dials for the hour and second, center minute hand, and the calendar complication are made a feature through three apertures. The 31-260 REG QA automatic caliber was designed especially for this model. Included among its special features are a high-tech regulator with Pulsomax escapement and Spiromax balance spring in Silinvar, both new developments from the Patek Philippe Advanced Research department.
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