2015 will be the third year of the leap year cycle: 2012 was a leap year, and next one will be 2016.

The leap year indication (a small window with arabic/roman numbers or a subdial with a small hand indicating 1-4) on perpetual calendars will jump on number “3”.

Why do leap years have a 4-years cycle? And how do perpetual calendars work? Learn more!

Patek Philippe ref. 5270G: cronografo con calendario perpetuo