The perpetual calendar is one of the most innovative and romantic complications in all of horology. Because 2016 is a leap year, all but the most complicated calendar watches are going to require that extra step of work come the end of February — making the perpetual calendar (also called a QP, an abbreviation of the French term quantième perpétuel) the holy grail of timekeeping. From the small window in the dial displaying the day of the month to the day of the week, a QP seamlessly counts everything from seconds to leap-year cycles, plus it only needs to be adjusted once a century. Yes, we said once a century.
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