(TrendHunter.com) Audemars Piguet introduces its latest creation in the form of the Royal Oak Perpetual Calendar timepiece. It is a limited-edition design made with the help of John Mayer. The watchmaker redefines…(TrendHunter.com) Audemars Piguet introduces its latest creation in the form of the Royal Oak Perpetual Calendar timepiece. It is a limited-edition design made with the help of John Mayer. The watchmaker redefines…