This limited edition consists of a very refined version of iconic Chrono 4 to celebrate the anniversary of the Maison (130 pieces). The steel case has the same dimensions as the standard edition but it houses a skeleton dial, argenté or black, which reveals the main plate and the wheels with DLC® finishing, protected by an upper bridge in a special sapphire glass that is 3 tenths of a millimetre thick, an element of highly complex construction. A rhodium plaque, secured to the main plate by two screws, shows the name of the model and the historic trademark of Eberhard & Co., as used for the first wrist chronograph in 1919. The sapphire glass case-back provides a view of the circular oscillating weight, finished with Côtes de Genève and customised with the number 130. This edition comes with a grey-black carbon-wear strap.