Magnetic fields and your watch

Magnetic fields can affect the proper functioning of the watch if they magnetize certain steel parts in the movement, especially the balance spring. The hairspring's coils can stick together and force the acceleration of the balance wheel. 

Fortunately, the effects of magnetization are not irreversible, and not inherently dangerous.

However, it is advisable to have the watch demagnetized by a professional.

The best way to preserve your watch is to follow this simple rule: do not place your watch near any electronic device, such as your bedside table next to your cell phone.

This also applies to computers, tablets, magnets, speakers etc.