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Rolex

Not that big in fact...

 

....It should be more thick, but the engineersof Rolex have manages to "reduce" the case so that it has resisted pressure from 3900metres, thanks to the steel ring doped with nitrogen.
Without this ring, it would have been more thick to get at that depth.
(I had seen the diagrams and patent filings on a French forum, but I can not find anymore, sorry)

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