
The dreaded blight of our 21st century...MAGNETISM.
Bombarded by electromagnetic radiation and especially magnetic flux (loudspeakers, mobile phones, handbag magnetic clasps, alarm clocks etc) our watches are at risk.
In my case, it was moving house and the bagful of watches in the car boot (trunk for US readers) next to my powerful sub-woofer for a week was enough to magnetise half the watches.
Some were out by 15 - 20 minutes a day!
I used a LEPSI App on iPad to confirm magnetism and bought a Swiss demagnetiser (ELMA) that I can use repeatedly in future.
Note, there are Chinese-made demagnetisers too but I have no experience of them.
Regards,
MTF
P.S. Magnets on handbag clasps are vicious as they are now high magnetic flux neodymium jobbies.