The Parmigiani Fleurier Centum Perpetual Calendar Openworked Graphite is an open-dial version of Parmigiani’s existing Centum Perpetual Calendar. This isn’t an openworked watch in the traditional sense of that term – openworking, or skeletonizing, is the removal of material from the movement of a watch in order to create a sense of transparency. The Centum Perpetual Openworked, on the other hand, has a transparent, tinted dial that lets you see some of the mechanisms driving the perpetual calendar as well as the moonphase disk.