Patek Philippe has just unveiled a new version of their iconic Calatrava Ref. 5227. The new timepiece features a solid dust cover protecting its clear case back. This “hunter” or “officer’s” case back is unique on the market in that is has invisible hinges. Furthermore, the solid case back, on top of the sapphire caseback, adds barely anything to the very thin timepiece, which measures 39 mm in diameter by only 9.24 mm thick, assuring the wearer the comfort and elegance that the Calatrava is known for. The perfectly integrated dust cover was designed and conceived in-house.