Create a DIY perpetual calendar using this free watercolor printable! It’s easy to make with Mod Podge and a few other basic ...

That said, it should be noted that this is a heavyweight piece of watch engineering in its own right, with more parts in the annual-calendar movements than there are in the perpetual movements ...

Patek Philippe divides its current collection into complications (world timers, chronographs, and annual calendars) and grand complications (perpetual calendars, tourbillons, chiming watches ...