In 1996 Patek Philippe was granted a Swiss Patent for an Annual Calendar mechanism automatically indicating the correct date for months date with 30 and 31 and only needing to be corrected once a year at the transition from February to March.
The first Patek Philippe model equipped with an Annual Calendar was the Reference 5035. Since then other 20 models, in various case metal and dial variations, have been presented.
This year, to celebrate the 20th anniversary of its patented Annual Calendar, Patek Philippe has launched a new model of this convenient and user-friendly complication.
The new Patek Philippe Annual Calendar Ref. 5396, housed in a classic 38.5 mm round case with a smoothly polished bezel, is available in rose gold with a silvery white opaline dial and in white gold with a dark gray sunburst dial.