The 656 caseback is not a composite material ... Mr. Schmidt said that they managed to make the shielding material the same look and hardness as the rest of the case (316L material).Originally Posted by rfrazier
Apparently a major hurdle in the production of antimagnetic watches is the dial, by the way (the movement ring is not a great challenge, by comparison). The dial-makers need massive help from Sinn to put the dial print onto the antimagnetic dials which obviously have different properties from brass (or whatever material is used) dials..