“how does a case tube get damaged?”
Being as the crown on the case tube sticks out from the edge of the case, that tends to be a focal point for impact what you hit a door jam, the corner of a wall, a desk, anything hard and immovable. From the sound of your reference to diving with the watch on your wrist, a fair amount of your leisure time is taken up with active pursuits. Your Omega was well designed to tolerate the rigours of active use, but like most watches, they tend to suffer damage when use becomes abuse. You may not consider incidental accidents as abuse, but that is what it amounts to. And when you are pushing the limits (as in diving), that is when the results of those accidents begins to show up. Your watch is durable, but not indestructible.
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