For Caliber 240, the 40th anniversary of the birth of the Caltrapa movement, creating a Calatrava skeleton watch that has been part of Patek Philippe's existing collection since 2008 undoubtedly best demonstrates the extraordinary appeal of this ultra-thin self-winding movement. As a result, we are pleased to announce the new 5R Calatrava "Squelette" openwork watch Ref. 5180 / 1R in 2017 that will complement this elegant mechanical masterpiece with the exquisite workmanship and exquisitely carved engravings Dream charm. The precise Caliber 240 SQU movement exudes an elegant temperament and transparency when it travels and deserves to be a mechatronic masterpiece in the movement's manufacturing process. The movement of the motherboard and the splint have been chiselled to maximize the charm of the hollow design, without detracting from the reliability and functionality of the movement. Hollow processing requires not only extraordinary artistic talent, but also must have a steady pair of rock and roll skilled, and watchmakers must also know the limits of hollow processing in the end where. The clockwork box on the main board is hollowed out to reveal the mainspring under the Calatrava openwork sign. The Calatrava Crosshair sign is a brand logo that Patek Philippe registered more than 100 years ago. The hollowing out of the movement's components takes more than a week, but it's still far from over. The next step needs to be done on the carver's workbench. The carver will use his own technology to finish the movement. He needs to spend more than 130 hours to decorate the rest of the movement, carving out exquisite vines and arabesque patterns. The brand signature for the words "Patek Philippe Genève" needs to be engraved on the remaining part of the barrel case, just around the Calatrava crosshair pattern, and the crosshair pattern also needs finishing. In addition, Patek Philippe imprint of the "PP" logo also appeared for the first time in 22K gold Mini Auto Disc surface. Finally, the hollow skeleton finished movement "skeleton" need to electroplating rose gold, and then polished to echo the case and bracelet. Now the most crucial step is to put a Caliber 240 thin self-winding movement on an 18-karat rose gold (5N) movement retaining ring. The ring frame itself also needs to hollow out processing, forming 12 spokes, as a time scale. A huge amount of work and openwork carving terms of cost and will not break any basic watchmaking principles, because in the end the finished watches every day to go when the error does not exceed -3 to +2 seconds, fully meet the stringent requirements Patek Philippe imprint. This is due to the use of high-tech Silinvar to a large extent. Spiromax material manufacture. Balance spring, on Ref.5180 / 1R watch, you can directly appreciate the gossamer completely hollow of the movement exudes flash Chiang Kai-shek Bright purple sheen. Patek Philippe Caliber 240 SQU movement with a round rose gold Calatrava case also reduced to a slim bezel to highlight the extraordinary charm of the movement. The large sapphire crystal and transparent cover not only ensure complete watch the entire transparent, while bringing comprehensive protection and 3 atm (30 meters) of water resistance. Ref.5180 / 1R with a soft 18K rose gold bracelet, and with a folding clasp. This article is reproduced, does not represent the world position of million table.