The Halda Space Discovery wristwatch is based on a revolutionary concept with interchangeable time modules and a docking system. The wearer has the choice of two modules: a conventional mechanical one or an enhanced electronic module for space. The watch was developed in cooperation with astronauts and tested on board the Discovery space shuttle. The casing is made of Tecamex, a NASA-certified material, which symbolises the high durability and precision of the watch movement.