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Anti-magnetism
The precision of mechanical watches is easily affected by the magnetic fields of everyday life.
Anti-magnetic watch Swiss standard: precision tolerance of maximum +/- 30 seconds a day
under a magnetic field of 4,800 A/m
Special case construction with soft iron jacket around the movement
Engineer Master II & Engineer II collections : up to 4,800 A/m
Engineer Hydrocarbon collection : up to 12,000 A/m
Engineer II Magneto S & Engineer II Volcano: up to 80,000 A/m
Engineer III collection up to 80,000 A/m
Это первоисточник))
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