Omega

mrsnak
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I own both...

And never considered that... This is from Omega:

Are OMEGA watches resistant to magnetic fields ?
Yes. OMEGA watches are anti-magnetic in accordance with the definitions of the ISO 764 standard. This standard is based on the accidental passage of a watch in a magnetic field of 4,800A/m, i.e. 0.006 Tesla. As part of the ISO 764 test, the watch is placed in a magnetic field along 3 different axes, for one minute each time:

Parallel to the plan-view of the watch, in the direction from 3 o'clock to 9 o'clock
Then in the direction from 6 o'clock to 12 o'clock
Then along an axis perpendicular to the plan-view of the watch.

In order to pass the test, a mechanical watch should not stop within the three periods indicated above. The effect of the residual magnetism should not exceed 30 seconds per day for a gents watch and 45 seconds per day for a ladies watch.

This at least speaks for the later models of which the Dynamic should be a part of. The Mk II goes back to the late 60s and all the Speedmasters were antimagnetic.