ENHANCED ANTI-MAGNETISM

Magnetism - the main reason automatic watches need service.

The proliforation of magnetic fields, founds in common objects that are now a part of our daily lives, can compromise and even stop an automatic watch.  Watches are now exposed to magnetic fields from computer drives, speakers, iPad covers, iPhones and even refrigerator magnets.

ISO 764 - A REFRIGERATOR MAGNET?

Carbon Steel and Brass are ferromagnetic.  In the presence of a magnetic field they will become magnetized as well. They will "remember" their magnetic history once the presence of the magnet is removed.  This tendency to become magnetized is debilitating to automatic watches.

When a watch enters a magnetic field small components, such as the escapement and balance wheel, can become magnetized.  The coils of the balance wheel will be attracted to each other and end up ‘sticking’ which will shorten the active length of the wheel and cause the watch to gain huge amounts of time and eventually stop.

In order to satisfy ISO 764, an automatic movement must run within a +/- 30 seconds per day deviation after experiencing a magnetic field of 4,800 A/m or 60 Gauss for 1 minute.  Today, a magnetic field of 4,800 A/m is very common. 

Small magnets, like those found in your iPad cover, a refrigerator magnet, stereo speakers or computer monitor, produce magnetic fields greater than 4,800 A/m.  Even frequent high-altitude flying can magnetize a ISO 764 compliant watch.  

ISO 764 standards fall short of protecting movements in modern times.

THE SEAHOLM SOLUTION

THE SEAHOM ARMCO® PURE IRON MOVEMENT CAGE

Unlike carbon steel or brass, pure iron has unique properties.  In the presence of a magnetic field, it will become magnetized but when the source of the magnetic field is removed, pure iron will not "remember" it's magnetic state.  

In previous generations, anti-magnetic watches were the exception, not the norm.  Unless you were are engineer working with strong magnetic forces the propensity of a watch to become magntize during daily use was rare.  This is no longer the case.

SEAHOLM uses an ARMCO® 99.8% pure iron movement cage to accept the magnetic charges when exposed to magnetic fields and "release it" once it the fields have been removed. The iron case includes the dial, the movement holder and the case back.  The internal carbon steel and brass parts remain unaffected.

Seaholm automatic watches can withstand magnetic forces to 33,500 A/m or 420 Gauss with NO deviation in accuracy.

This is at least 7 times the ISO standard.

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