Seamaster possibly magnetized?

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I recently had my first proper case of magnetisation, a laptop was placed on top of my watchbox overnight. A vintage ultra thin UG disco volante was the only piece affected. It was running 5-6 hours fast a day! A few seconds on the demagnetiser and it was all back to normal. In the past I have tried those phone apps but the results were not always consistent for me.

@Archer : are there any issues with trying to demagnetise a watch that is not magnetised?
 
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As I understand it... I've not googled very long, this Lepsi app uses your phone's built in compass and detects it shifting when a magnetic objects comes near it.

As for the phone magnetizing your watch... it may have magnetic parts, but probably nothing that can easily effect your watch and especially near the phone's compass... otherwise you compass would not work at all. For the purposes of using the Lepsi app to check it's probably fine.

Sharing my own experience, I just tried the Lepsi app and found four of my watches were magnetized. After demagnetizing the Lepsi app stopped consistently marking those watches as magnetized.
Thanks for clearing that up 馃憤
 
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@Archer : are there any issues with trying to demagnetise a watch that is not magnetised?

No, as long as you use the demagnetizer properly, it's fine.
 
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I just received two watches in the mail yesterday. One was returning from being serviced, and the other was not serviced, but supposedly keeping good time. The serviced watch is running ~25s fast/day and the unserviced one more than 1 minute fast. I downloaded the Lepsi app, and sure enough, both are magnetized. I checked a few other watches, and they did not register as being magnetized. I guess I need to buy a demagnetizer.