By looking at it, one would never guess the complicated mechanism hidden behind it. The simple aspect of its silver guilloché dial, identical to that of the Chronomètre Souverain, hardly lets foresee the discrete window placed between 9 and 10 o’clock. It features the hammers striking the gongs at the hour, the quarters, and the minutes, which can be activated by pressing a delicate indented slide on the left side of the case. This redevelopment has merited the application of two patents.