Robust and Durable The role of the case is central to the watch. It provides a means of protecting the dial and movement from dust and moisture as well as harmful shocks. TAG Heuer makes many cases within its own facility, produced to exacting standards. A case starts life as a piece of metal. Lengths of flat metal are fed into a stamping machine. The rough case is punched from the metal sheet using colossal pressure, between 40 and 80 tonnes.