7140R Grand Complications 35.1mm Mink Gray/Royal Purple Shiny Alligator Straps Silvery-White Opaline Dial Diamond-set Rose Gold Bezel
7140R Grand Complications 35.1mm Mink Gray/Royal Purple Shiny Alligator Straps Silvery-White Opaline Dial Diamond-set Rose Gold Bezel
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To keep track of months with different numbers of days, including February 29th in leap years, a mechanical movement needs to have a "memory" that spans four years, or 1,461 days. This requires a highly advanced mechanism that uses a system of levers and cams that rotate around their axes. Patek Philippe has a long history of expertise in this area and is well-known for its ability to create such complex mechanisms.
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