Annual Calendar. Many watches display the date on their dial. But since some months have only thirty, twenty-nine of twenty-eight days, you need to adjust the date at least five time per year. A annual calendar is a mechanism that automatically takes into account whether a month has 30 or 31 days so that the watch displays the correct date each month without the need of adjustment. A annual calendar watch will only need to be corrected one a year, every March 1.
Patek Philippe Ref. 5960P. The Patek Philippe Ref. 5960P is a annual calendar watch with a chronograph. From the 10 o'clock position to the 2 o' clock position it displays day, date and month, with a power reserve indicator below the date aperture.
At the 6 o'clock position is the chronograph sub-dial. Most chronographs have have a subdial to display intervals of 30 minutes, and another for measuring a period of up to 12 hours. The Ref. 5960P has a single sub-dial with two hands which serves as both a the 30 minute and 12 hour totalisers. Patek calls this the mono-counter dial. Inside the mono-counter dial is a day night indicator.
All these complications are made possible by the 456 individual parts of the self-winding CH 28-520 IRM QA 24H movement. The self winding movement produces 28,800 vibrations per hour. The movement is visible through a clear crystal case back. The Ref. 5960P has a case diameter of 40.5 millimeters.
The Ref. 5960P is available only in Platinum with a brown alligator strap.
About Patek Philippe. Patek Philippe & Co. was founded in Switzerland in 1851. The companies emblem, the Calatrava Cross, was adopted by it at the end of the 19th Century. It is acknowledged as one of the finest, if not the finest, watchmaker in the world.
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