I'm flabbergasted that anyone would worry about crushing a ceramic (or SS for that matter) case at depths beyond 600M. Who in their right mind would dive beyond 600M? Generally, you can't see squat beyond 250 FEET. What do you think 600M of water is going to do to your head--let alone your watch?
Has there ever been a 42mm or smaller cased ceramic Speedmaster? I love the various Side of the Moon iterations, but my 6.5 inch wrist can’t pull off a 44mm watch.
I got 6.5” inch too and I have to say the Apollo 8 wears pretty light and sits nicely on the wrist. Besides the A8 I wear only 40mm or 39mm watches.