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IWC

Thickness is an important factor...

 

The Ingenieur has a higher rating of 80,000A/m as the thickness of the date plate is thicker than the pilot, at about 0.9mm.
However, with increase thickness, it could also affect the casing overall thickness too.

Kong

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The IWC AntiMagnetic Soft Iron-Cage

 
By: Kong : October 5th, 2007-13:07
Sincere Watch Academy , Singapore (4 October 2007) The topic for the Sincere Horology Colloquiums was "Unearth the Dynamism of IWC, Engineered for Men". The chapter I found to be most interesting was the antimagnetism soft-iron cage. A sample of a cut-out...  

Thanks Kong !

 
By: Wylie194 : October 5th, 2007-22:13
Great and very informative post. Never realized that the alloy cage is that thick ! Interesting observation on the dial and cage interface too.

The date aperture ...

 
By: AndrewD : October 6th, 2007-02:53
Hi Kong, I am wearing a Mark XV as I type this and I didn't realise that the dial comprised part of the antimagnetic cage. I wonder if the date aperture compromises the antimagnetic characteristics of the watch in any way? Very informative series of photo...