<http://blog.berrysjewellers.co.uk/incredible-patek-philippe-annual-calendar-watches-for-the-lady-the-gentleman/#webpage>
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"The Annual Calendar is a highly sought after complication that Patek Philippe officially patented in 1996, after years of research and development. Read on to learn all about it."
<http://blog.berrysjewellers.co.uk/incredible-patek-philippe-annual-calendar-watches-for-the-lady-the-gentleman/>