In shades of anthracite and blue, this Endeavour Perpetual Calendar revisits H. Moser & Cie.’s emblematic complication in a visually striking manner. Combining tantalum, a stable and durable metal with a unique hue that’s exceedingly difficult to machine and polish, with the ancestral technique of “grand feu” enamelling, a new dimension of vibrant colours and textures enhances the world’s most intuitive and legible perpetual calendar watch. Further refining its precision, the movement is equipped with a double hairspring, optimizing timekeeping accuracy while also reducing the effects of gravity.