Celebrating the 40th anniversary of the release of their calibre 240, Patek Philippe released the fully skeletonized ref. 5180/1R Squelette to celebrate the occasion during Baselworld 2017. For this new iteration of the Calatrava ref. 5180/1R, the automatic calibre 240 has been magnificently skeletonized and engraved in which could only be described as an horological work of art. The aesthetic appeal and transparency with which the caliber 240 SQU keeps track of time makes it a miniature opus of kinetic art.