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As far as I can tell ... other than the movement itself and bezel ... the cases seem the same. Since that appears to be the case, what is different that accounts for the difference in water resistance ratings (100m vs 200m)?

Perhaps the thickness of the acrylic crystal? Can these be swapped? Are the seals different? Both have screw down crowns .... so I guess that's not it.

Hmmm .... Perhaps I should open one up.
 

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You're right, the acrylic is thicker on the Amphibian. The Amphibians also have a supporting ring beneath the acrylic whereas the 35s don't.
 
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