Audemars Edward Piguet Quantieme Perpetual Calendar with Moonphase - a limited collection as not many of this model are available in the market. Come in 18K Yellow gold with screw-on case back. It is just watch only, come with a 3rd party strap and a 3rd party gold-plated buckle. Good working condition. 
 
Edward Piguet Quantieme万年历 - 有限的生产，因此这个模型在市场上不是很多。 表壳是18K 表带和手表不是AP原装. 包括手表盒和室内保修.
万年历是手表上有日期，星期，月，年，闰年窗口，有时甚至几个世纪，包括月的不同长度和每四年的闰年。典型的万年历具有从每秒几次（例如，平衡轮）一直到每四年一次的轮 。
 
A perpetual calendar keeps track of date, weeks, months, year, leap years, and sometimes even centuries, including leap years every four years. A typical perpetual calendar has wheels (gears) turning from several times per second all the way to once every four years.