Is the Oysterquartz antimagnetic?
Yes. Quartz movements are typically very vulnerable to magnetic fields which tend to depolarize the magnets used in the stepper motor. The typical method used to avoid this problem is to enclose the movement within an antimagnetic casing (usually made of soft iron). However, the 5035/5055 movement is antimagnetic by design up to 1000 Oersted and requires no external shielding. The only other watch ever produced by Rolex that was similarly antimagnetic without shielding was the extremely rare Milgauss 6543, of which only 88 pieces were ever made.
