Antimagnetic
Also called anti-magnetic
Antimagnetic describes a watch designed to resist magnetic fields, either by shielding the movement with a soft-iron cage or by using non-magnetic materials in critical parts like the hairspring.
Resistance levels vary widely. Master Chronometer certification, for example, includes testing a complete watch in a magnetic field of fifteen thousand gauss.[1]
Strong antimagnetic performance is a real practical advantage for everyday wear and a selling point for the models that have it.
For older watches without these protections, magnetization remains one of the most common reasons for sudden poor timekeeping, so it's worth ruling out before assuming a watch needs a full service.
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