The SINN technologies used in the 756 series make it resistant to external influences like scratches and extreme temperatures. This starts with the TEGIMENT technology used for the cases of these watches.
Because the guide elements are integrated in the case, the conventional screwed-in or pressed-in tubes and their seals could be eliminated. Seals are always a possible source of adverse influences. However, where seals are indispensable, we use a material familiar from vacuum technology, which more effectively prevents moisture from penetrating the watch case. The same purpose is served by the glass seals, which are likewise made of an innovative material, are particularly resistant to UV radiation and have outstanding chemical resistance. What little moisture might still penetrate the watch case can be easily dealt with by the Ar-Dehumidifying Technology from Sinn. The result: extended functional reliability of the movement.