Gauss for non-METAS watches

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With the danger of sounding as clueless as I am in this subject...

We read/hear that the new Metas Speedy is 15,000 Gauss as are all of the new Master Chronometers that Omega make.

But what is the rating for the 1861 & 1863 variants?

Are the 1861/3 watches OK to sit next to a mobile phone - and how strong in anti-magnetic shielding or how strong would it need to be to do so?
 
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Magnetic strength decreases as the inverse cube of the distance. So, a few inches away ought not affect it much, for example if you do as I do and hold your phone in your left hand. I don't have any specific number for you, though.