A year with two anniversaries and fascinating debuts. Patek Philippe can look back to an uninterrupted legacy of 178 successful years in business, so it is not surprising that the suite of anniversaries is becoming denser. They prompt the Genevan manufacture to craft commemorative watches that recall significant events. In 2017, the Aquanaut collection is celebrating its 20th birthday with an anniversary model while the ultra-thin self-winding caliber 240 movement can showcase its many facets with a number of timepieces presented on the occasion of its 40th anniversary. The future is unfolding with a new perpetual calendar watch featuring a timelessly classic "vintage" design, and also with the latest milestones in the "Patek Philippe Advanced Research" series that are united in a limited edition of the Aquanaut Travel Time.