PATEK PHILIPPE Perpetual calendar Watch | New ＆ Used Items List

Patek Philippe strives to reach the pinnacle of watchmaking by pursuing the ultimate in research and challenging timepieces. The word "perpetual" means "forever," hence the name "perpetual calendar." It automatically detects the end of each month and leap years. Therefore, manual adjustments are not required, not only annually but also every four years. The perpetual calendar detects leap years up to the year 2100. Since 2100 is divisible by 100 and is not a leap year according to the Gregorian calendar, an adjustment is required. To detect the four-year leap year cycle, the perpetual calendar features a complex mechanism that completes one rotation every four years.
As the world's most complicated portable watch, it has timeless value.