The case alone is a quality for itself.

The manufacturer of the case is the „Sächsische Uhrentechnologie GmbH Glashütte / SA“ (SUG), a saxonian company that is linked with Sinn. SUG is the only German case manufacturer certified for the demanding standard DIN 9002.

The stainless steel which is used for the case and metal bracelet (option) corresponds to the austere standard DIN 1.4435 which is obligatory for medical implants.
With this kind of stainless steel the amount of nickel diffusion towards the skin is 50 times lower compared with ordinary stainless steel. Therefor people with nickel responsiveness should not get allergic reactions.